My iMac is telling me I have to shut down and restart; reminds me of the blue screen of death many years ago on my old PC.

A greyness rolls down the screen and then a box appears in the middle saying, in several languages, something like, "You must shut down your computer. Press and hold the button until it shuts down. Then press it again to restart. "
The first time it happened this morning, I had actually just left my computer about ten minutes prior, having restarted it as I often do when I leave it so it will be fresh for my next session. So it shut down on the screen with all my family's usernames.
The second time it happened, a few minutes ago, I only had Mail open and Safari with just one website open, and I'd only just got back on the computer 5 minutes prior.
The only recent changes I can think of are that my husband installed 8 GB of RAM over the weekend and I moved about 200 GB of data from my internal hard drive to an external hard drive that stays connected to my iMac all the time.
This is scary; I've never heard of this happening on a Mac. And my iMac is barely 1 year old. Can you tell me what's going on? Do I need to do something to fix it?

What is a Kernel Panic?
http://support.apple.com/kb/TS3742
and http://support.apple.com/kb/TS1892?viewlocale=en_US
http://developer.apple.com/mac/library/technotes/tn2002/tn2063.html
More details here:
http://www.thexlab.com/faqs/kernelpanics.html
Useful article on how to avoid and eliminate kernel panics here:
http://reviews.cnet.com/8301-13727_7-10344626-263.html?tag=mfiredir

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nterval Since Last Panic Report: 7854 sec
Panics Since Last Report:          3
Anonymous UUID:                    9ECF6F3D-32CF-4469-9ED0-D8C0B393DF03
Mon Feb 24 12:51:45 2014
panic(cpu 1 caller 0x2abf6a): Kernel trap at 0x0023184c, type 14=page fault, registers:
CR0: 0x8001003b, CR2: 0xffffff8b, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x00000000, EBX: 0x52a75024, ECX: 0x0000002c, EDX: 0x00869f20
CR2: 0xffffff8b, EBP: 0x59313e88, ESI: 0x52a66050, EDI: 0x00000000
EFL: 0x00010006, EIP: 0x0023184c, CS: 0x00000008, DS: 0x00000010
Error code: 0x00000002
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x59313c78 : 0x21b837 (0x5dd7fc 0x59313cac 0x223ce1 0x0)
0x59313cc8 : 0x2abf6a (0x59e3d0 0x23184c 0xe 0x59e59a)
0x59313da8 : 0x2a1a78 (0x59313dc0 0x6498 0x59313e88 0x23184c)
0x59313db8 : 0x23184c (0xe 0x48 0x59310010 0x4f4a0010)
0x59313e88 : 0x226959 (0x52a75024 0x2c 0x83f00dc 0x2c)
0x59313ef8 : 0x2275b0 (0x8afb3f0 0x8afb3f0 0x59313f58 0x233203)
0x59313f68 : 0x227631 (0x552ed0 0x8fc5f40 0x0 0x8afb3d4)
0x59313f88 : 0x552f8c (0x552ed0 0x8fc5f40 0x823c7f5f 0x2ab22a)
0x59313fc8 : 0x2a179c (0x8fc5f40 0x0 0x10 0x8ac0604)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K549
Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
System model name: MacBookPro7,1 (Mac-F222BEC8)
System uptime in nanoseconds: 189424457620
unloaded kexts:
com.apple.driver.AppleMCP89RootPortPM 1.11 (addr 0x1438000, size 0x20480) - last unloaded 94286283321
loaded kexts:
com.apple.driver.AppleHWSensor 1.9.3d0 - last loaded 28388780761
com.apple.driver.AGPM 100.12.31
com.apple.filesystems.autofs 2.1.0
com.apple.driver.AppleMikeyHIDDriver 1.2.0
com.apple.driver.AppleMikeyDriver 2.0.5f14
com.apple.driver.AppleHDA 2.0.5f14
com.apple.kext.AppleSMCLMU 1.5.2d10
com.apple.driver.AppleLPC 1.5.1
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com.apple.driver.ACPI_SMC_PlatformPlugin 4.7.0a1
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com.apple.driver.AppleMCCSControl 1.0.20
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com.apple.driver.AppleBacklight 170.0.46
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AudioIPCDriver 1.1.6
com.apple.driver.AppleUSBTCButtons 201.6
com.apple.driver.AppleIRController 303.8
com.apple.driver.AppleUSBTCKeyboard 201.6
com.apple.driver.AppleUSBCardReader 2.6.1
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com.apple.iokit.IOAHCIBlockStorage 1.6.4
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com.apple.driver.AppleSmartBatteryManager 160.0.0
com.apple.driver.AppleUSBHub 4.2.4
com.apple.driver.AppleAHCIPort 2.1.7
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com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 142.6.0
com.apple.security.sandbox 1
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.1.14
com.apple.driver.AppleIntelCPUPowerManagement 142.6.0
com.apple.driver.DspFuncLib 2.0.5f14
com.apple.driver.AppleSMBusController 1.0.10d0
com.apple.driver.AppleProfileReadCounterAction 17
com.apple.iokit.IOFireWireIP 2.0.3
com.apple.driver.AppleHDAController 2.0.5f14
com.apple.iokit.IOHDAFamily 2.0.5f14
com.apple.driver.AppleProfileTimestampAction 10
com.apple.driver.AppleProfileThreadInfoAction 14
com.apple.driver.AppleProfileRegisterStateAction 10
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com.apple.driver.AppleProfileCallstackAction 20
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com.apple.nvidia.nv50hal 6.3.6
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com.apple.driver.BroadcomUSBBluetoothHCIController 2.4.5f3
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com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.8
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com.apple.kext.AppleMatch 1.0.0d1
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com.apple.driver.DiskImages 289.1
com.apple.iokit.IOStorageFamily 1.6.3
com.apple.driver.AppleACPIPlatform 1.3.6
com.apple.iokit.IOPCIFamily 2.6.5
com.apple.iokit.IOACPIFamily 1.3.0
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Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.10.131.42.4)
Bluetooth: Version 2.4.5f3, 2 service, 12 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HTS545025B9SA02, 232.89 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: Internal Memory Card Reader, 0x05ac (Apple Inc.), 0x8403, 0x26100000 / 2
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8507, 0x24600000 / 2
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06600000 / 4
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8213, 0x06610000 / 7
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x06500000 / 3
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0236, 0x06300000 / 2

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panic(cpu 6 caller 0xffffff80190ac90b): Releasing non-exclusive RW lock without a reader refcount!
Backtrace (CPU 6), Frame : Return Address
0xffffff81096e3a80 : 0xffffff801901d626
0xffffff81096e3af0 : 0xffffff80190ac90b
0xffffff81096e3b10 : 0xffffff801911c09c
0xffffff81096e3d40 : 0xffffff8019110e92
0xffffff81096e3d70 : 0xffffff80190ff954
0xffffff81096e3ef0 : 0xffffff80190ffa10
0xffffff81096e3f50 : 0xffffff80193e182a
0xffffff81096e3fb0 : 0xffffff80190ced33
BSD process name corresponding to current thread: installd
Mac OS version:
12C60
Kernel version:
Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
Kernel UUID:
Kernel slide:     0x0000000018e00000
Kernel text base: 0xffffff8019000000
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System uptime in nanoseconds: 11938612497736
last loaded kext at 606795969288: com.line6.driver.xtaudio    7.2.3 (addr 0xffffff7f9b360000, size 1024000)
last unloaded kext at 207361764339: com.apple.driver.AppleUSBUHCI    5.2.5 (addr 0xffffff7f99ac8000, size 65536)
loaded kexts:
com.line6.driver.xtaudio    7.2.3
net.telestream.driver.TelestreamAudio    1.1.0
com.logmein.driver.LogMeInSoundDriver    1.0.2
at.obdev.nke.LittleSnitch    3876
com.seagate.driver.SeagateGoFlexBlockSizeAdjuster    5.2.2
com.apple.driver.AppleBluetoothMultitouch    75.15
com.apple.driver.AppleHWSensor    1.9.5d0
com.apple.driver.AudioAUUC    1.60
com.apple.driver.AGPM    100.12.69
com.apple.driver.AppleMikeyHIDDriver    122
com.apple.driver.AppleHDA    2.3.1f2
com.apple.filesystems.autofs    3.0
com.apple.iokit.IOUserEthernet    1.0.0d1
com.apple.driver.AppleUpstreamUserClient    3.5.10
com.apple.iokit.IOBluetoothSerialManager    4.0.9f33
com.apple.kext.AMDFramebuffer    8.0.0
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AppleMikeyDriver    2.3.1f2
com.apple.driver.AppleBacklight    170.2.3
com.apple.driver.AppleLPC    1.6.0
com.apple.driver.ApplePolicyControl    3.2.11
com.apple.AMDRadeonAccelerator    1.0.0
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport    4.0.9f33
com.apple.driver.AppleMCCSControl    1.0.33
com.apple.driver.ACPI_SMC_PlatformPlugin    1.0.0
com.apple.driver.AppleIRController    320.15
com.apple.driver.AppleUSBCardReader    3.1.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    34
com.apple.iokit.SCSITaskUserClient    3.5.1
com.apple.driver.XsanFilter    404
com.apple.iokit.IOAHCIBlockStorage    2.2.2
com.apple.driver.AppleUSBHub    5.2.5
com.apple.driver.AppleFWOHCI    4.9.6
com.apple.iokit.AppleBCM5701Ethernet    3.2.5b3
com.apple.driver.AirPort.Atheros40    600.70.23
com.apple.driver.AppleAHCIPort    2.4.1
com.apple.driver.AppleUSBEHCI    5.4.0
com.apple.driver.AppleEFINVRAM    1.6.1
com.apple.driver.AppleACPIButtons    1.6
com.apple.driver.AppleRTC    1.5
com.apple.driver.AppleHPET    1.7
com.apple.driver.AppleSMBIOS    1.9
com.apple.driver.AppleACPIEC    1.6
com.apple.driver.AppleAPIC    1.6
com.apple.driver.AppleIntelCPUPowerManagementClient    196.0.0
com.apple.nke.applicationfirewall    4.0.39
com.apple.security.quarantine    2
com.apple.driver.AppleIntelCPUPowerManagement    196.0.0
com.apple.driver.AppleBluetoothHIDKeyboard    165.5
com.apple.driver.AppleHIDKeyboard    165.5
com.apple.driver.IOBluetoothHIDDriver    4.0.9f33
com.apple.driver.AppleMultitouchDriver    235.28
com.apple.driver.DspFuncLib    2.3.1f2
com.apple.kext.triggers    1.0
com.apple.iokit.IOSurface    86.0.3
com.apple.driver.AppleUSBAudio    2.9.0f6
com.apple.iokit.IOAudioFamily    1.8.9fc10
com.apple.kext.OSvKernDSPLib    1.6
com.apple.iokit.IOSerialFamily    10.0.6
com.apple.iokit.IOBluetoothFamily    4.0.9f33
com.apple.driver.AppleBacklightExpert    1.0.4
com.apple.driver.AppleGraphicsControl    3.2.11
com.apple.iokit.IOAcceleratorFamily    19.0.26
com.apple.iokit.IONDRVSupport    2.3.5
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport    4.0.9f33
com.apple.driver.AppleHDAController    2.3.1f2
com.apple.iokit.IOHDAFamily    2.3.1f2
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.iokit.IOFireWireIP    2.2.5
com.apple.kext.AMD5000Controller    8.0.0
com.apple.kext.AMDSupport    8.0.0
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.iokit.IOGraphicsFamily    2.3.5
com.apple.driver.AppleSMC    3.1.4d2
com.apple.driver.IOPlatformPluginLegacy    1.0.0
com.apple.driver.IOPlatformPluginFamily    5.2.0d16
com.apple.iokit.IOUSBHIDDriver    5.2.5
com.apple.iokit.IOUSBMassStorageClass    3.5.0
com.apple.driver.AppleUSBMergeNub    5.2.5
com.apple.driver.AppleUSBComposite    5.2.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.5.1
com.apple.iokit.IOBDStorageFamily    1.7
com.apple.iokit.IODVDStorageFamily    1.7.1
com.apple.iokit.IOCDStorageFamily    1.7.1
com.apple.iokit.IOFireWireSBP2    4.2.0
com.apple.iokit.IOSCSIBlockCommandsDevice    3.5.1
com.apple.iokit.IOAHCISerialATAPI    2.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily    3.5.1
com.apple.iokit.IOUSBUserClient    5.2.5
com.apple.iokit.IOFireWireFamily    4.5.5
com.apple.iokit.IOEthernetAVBController    1.0.2b1
com.apple.iokit.IO80211Family    500.15
com.apple.iokit.IONetworkingFamily    3.0
com.apple.iokit.IOAHCIFamily    2.2.1
com.apple.iokit.IOUSBFamily    5.4.0
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Since installing OSX 10 my iMac randomly shuts down and restarts. I can not determine why this is happening. Any ideas?

Since installing OSX 10, my iMac randomly shuts down and restarts. I can not determine why this is happening. Any ideas?

1. This is a comment on what you should and should not do to protect yourself from malicious software ("malware") that circulates on the Internet. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
If you find this comment too long or too technical, read only sections 5, 6, and 10.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user, but internally Apple calls it "XProtect." The malware recognition database is automatically checked for updates once a day; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
The following caveats apply to XProtect:
It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets.
It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
As new versions of OS X are released, it's not clear whether Apple will indefinitely continue to maintain the XProtect database of older versions such as 10.6. The security of obsolete system versions may eventually be degraded. Security updates to the code of obsolete systems will stop being released at some point, and that may leave them open to other kinds of attack besides malware.
3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't necessarily been tested by Apple, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
Gatekeeper doesn't depend on a database of known malware. It has, however, the same limitations as XProtect, and in addition the following:
It can easily be disabled or overridden by the user.
A malware attacker could get control of a code-signing certificate under false pretenses, or could simply ignore the consequences of distributing codesigned malware.
An App Store developer could find a way to bypass Apple's oversight, or the oversight could fail due to human error.
For the reasons given above, App Store products, and other applications recognized by Gatekeeper as signed, are safer than others, but they can't be considered absolutely safe. "Sandboxed" applications may prompt for access to private data, such as your contacts, or for access to the network. Think before granting that access. Sandboxing security is based on user input. Never click through any request for authorization without thinking.
4. Starting with OS X 10.8.3, a third layer of protection has been added: a "Malware Removal Tool" (MRT). MRT runs automatically in the background when you update the OS. It checks for, and removes, malware that may have evaded the other protections via a Java exploit (see below.) MRT also runs when you install or update the Apple-supplied Java runtime (but not the Oracle runtime.) Like XProtect, MRT is effective against known threats, but not against unknown ones. It notifies you if it finds malware, but otherwise there's no user interface to MRT.
5. The built-in security features of OS X reduce the risk of malware attack, but they're not absolute protection. The first and best line of defense is always going to be your own intelligence. With the possible exception of Java exploits, all known malware circulating on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "Trojan horses," which can only have an effect if the victim is duped into running them. The threat therefore amounts to a battle of wits between you and the malware attacker. If you're smarter than he thinks you are, you'll win.
That means, in practice, that you always stay within a safe harbor of computing practices. How do you know what is safe?
Any website that prompts you to install a “codec,” “plug-in,” "player," "extractor," or “certificate” that comes from that same site, or an unknown one, is unsafe.
A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
Pirated copies or "cracks" of commercial software, no matter where they come from, are unsafe.
Software of any kind downloaded from a BitTorrent or from a Usenet binary newsgroup is unsafe.
Software that purports to help you do something that's illegal or that infringes copyright, such as saving streamed audio or video for reuse without permission, is unsafe. All YouTube "downloaders" are outside the safe harbor, though not all are necessarily harmful.
Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. If it comes from any other source, it's unsafe. For instance, if a web page warns you that Flash is out of date, do not follow an offered link to an update. Go to the Adobe website to download it, if you need it at all.
Even signed applications, no matter what the source, should not be trusted if they do something unexpected, such as asking for permission to access your contacts, your location, or the Internet for no obvious reason.
"FREE WI-FI !!!" networks in public places are unsafe unless you can verify that the network is not a trap (which you probably can't.) Even then, do not download any software or transmit any private information while connected to such a network, regardless of where it seems to come from or go to.
6. Java on the Web (not to be confused with JavaScript, to which it's not related, despite the similarity of the names) is a weak point in the security of any system. Java is, among other things, a platform for running complex applications in a web page, on the client. That was always a bad idea, and Java's developers have proven themselves incapable of implementing it without also creating a portal for malware to enter. Past Java exploits are the closest thing there has ever been to a Windows-style virus affecting OS X. Merely loading a page with malicious Java content could be harmful.
Fortunately, client-side Java on the Web is obsolete and mostly extinct. Only a few outmoded sites still use it. Try to hasten the process of extinction by avoiding those sites, if you have a choice. Forget about playing games or other non-essential uses of Java.
Java is not included in OS X 10.7 and later. Discrete Java installers are distributed by Apple and by Oracle (the developer of Java.) Don't use either one unless you need it. Most people don't. If Java is installed, disable it — not JavaScript — in your browsers.
Regardless of version, experience has shown that Java on the Web can't be trusted. If you must use a Java applet for a task on a specific site, enable Java only for that site in Safari. Never enable Java for a public website that carries third-party advertising. Use it only on well-known, login-protected, secure websites without ads. In Safari 6 or later, you'll see a lock icon in the address bar with the abbreviation "https" when visiting a secure site.
Follow the above guidelines, and you’ll be as safe from malware as you can practically be. The rest of this comment concerns what you should not do to protect yourself.
7. Never install any commercial "anti-virus" or "Internet security" products for the Mac, as they all do more harm than good, if they do any good at all. Any database of known threats is always going to be out of date. Most of the danger is from unknown threats. If you need to be able to detect Windows malware in your files, use one of the free anti-virus products in the Mac App Store — nothing else.
Why shouldn't you use commercial "anti-virus" products?
Their design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the file system. Malware is downloaded from the network; it doesn't materialize from nowhere.
In order to meet that nonexistent threat, the software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
To recognize malware, the software depends on a database of known threats, which is always at least a day out of date. Most of the real danger comes from highly targeted "zero-day" attacks that are not yet recognized.
By modifying the operating system, the software itself may create weaknesses that could be exploited by malware attackers.
8. An anti-malware product from the App Store, such as "ClamXav," doesn't have these drawbacks. That doesn't mean it's entirely safe. It may report email messages that have "phishing" links in the body, or Windows malware in attachments, as infected files, and offer to delete or move them. Doing so will corrupt the Mail database. The messages should be deleted from within the Mail application.
An anti-virus app is not needed, and should not be relied upon, for protection against OS X malware. It's useful only for detecting Windows malware. Windows malware can't harm you directly (unless, of course, you use Windows.) Just don't pass it on to anyone else.
A Windows malware attachment in email is usually easy to recognize. The file name will often be targeted at people who aren't very bright; for example:
♥♥♥♥♥♥♥♥♥♥♥♥♥♥!!!!!!!H0TBABEZ4U!!!!!!!.AVI♥♥♥♥♥♥♥♥♥♥♥♥♥♥.exe
Anti-virus software may be able to tell you which particular trojan it is, but do you care? In practice, there's seldom a reason to use the software unless an institutional policy requires it.
The ClamXav developer won't try to "upsell" you to a paid version of the product. Other developers may do that. Don't be upsold. For one thing, you should not pay to protect Windows users from the consequences of their choice of computing platform. For another, a paid upgrade from a free app will probably have the disadvantages mentioned in section 7.
9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
10. As a Mac user you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither should you assume that you will always be safe from exploitation, no matter what you do. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. Nothing can lessen the need for safe computing practices.

This just started happening.. I open Itunes and the little round rainbow loading indicator just goes on and doesnt stop.. My itunes wont function.. It gets stuck. Then i have to force quit.. I tried to shut down and restart. also reloaded the latest itune

This just started happening.. I open Itunes and the little round rainbow loading indicator just goes on and doesnt stop.. My itunes wont function.. It gets stuck. Then i have to force quit.. I tried to shut down and restart. also reloaded the latest itune 11.1.3 and it still gets stuck.
i use an external HD and thats fine.. all files are in there. But I have no idea why my itunes app is getting stuck.
Am I the only person this is happening to? What can I do to correct this problem?

Hi marlonbnyc!
This article will help provide some basic troubleshooting steps that will serve as a guide for you to resolve this issue:
Mac OS X: How to troubleshoot a software issue
http://support.apple.com/kb/ht1199
Thanks for being a part of the Apple Support Communities!
Regards,
Braden

My iMac is telling me I have to shut down and restart; reminds me of the blue screen of death many years ago on my old PC.

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