Can't open iTunes on my iMac and when I try, the iMac freezes

Question

Help!
2009 iMac OS Mavericks v 10.9.4
iTunes version 11.3
EtreCheck report below:
EtreCheck version: 1.9.12 (48)
Report generated July 14, 2014 at 9:30:28 PM PDT
Hardware Information:
  iMac (27-inch, Late 2009) (Verified)
  iMac - model: iMac10,1
  1 3.06 GHz Intel Core 2 Duo CPU: 2 cores
  4 GB RAM
Video Information:
  ATI Radeon HD 4670 - VRAM: 256 MB
  iMac 2560 x 1440
System Software:
  OS X 10.9.4 (13E28) - Uptime: 2 days 4:11:2
Disk Information:
  ST31000528ASQ disk0 : (1 TB)
  EFI (disk0s1) <not mounted>: 209.7 MB
  }{?a (disk0s2) / [Startup]: 999.35 GB (489.14 GB free)
  Recovery HD (disk0s3) <not mounted>: 650 MB
  OPTIARC DVD RW AD-5680H 
USB Information:
  Apple Inc. Built-in iSight
  Apple Internal Memory Card Reader
  SAMSUNG SAMSUNG_Android
  Dynastream Innovations ANT USBStick2
  Apple Computer, Inc. IR Receiver
  Apple Inc. BRCM2046 Hub
  Apple Inc. Bluetooth USB Host Controller
Gatekeeper:
  Mac App Store and identified developers
Kernel Extensions:
  [not loaded] com.paceap.kext.pacesupport.leopard (5.9 - SDK 10.4) Support
  [not loaded] com.paceap.kext.pacesupport.master (5.9 - SDK 10.6) Support
  [not loaded] com.paceap.kext.pacesupport.panther (5.9 - SDK 10.3) Support
  [loaded] com.paceap.kext.pacesupport.snowleopard (5.9 - SDK 10.6) Support
  [not loaded] com.paceap.kext.pacesupport.tiger (5.9 - SDK 10.4) Support
  [loaded] org.virtualbox.kext.VBoxDrv (4.2.18) Support
  [not loaded] org.virtualbox.kext.VBoxNetAdp (4.2.18) Support
  [not loaded] org.virtualbox.kext.VBoxNetFlt (4.2.18) Support
  [loaded] org.virtualbox.kext.VBoxUSB (4.2.18) Support
Startup Items:
  VirtualBox: Path: /Library/StartupItems/VirtualBox
Launch Daemons:
  [loaded] com.adobe.fpsaud.plist Support
  [loaded] PACESupport.plist Support
Launch Agents:
  [running] com.brother.LOGINserver.plist Support
  [loaded] com.citrix.AuthManager_Mac.plist Support
  [running] com.citrix.ReceiverHelper.plist Support
  [running] com.citrix.ServiceRecords.plist Support
User Launch Agents:
  [failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
  [loaded] com.google.keystone.agent.plist Support
  [not loaded] org.virtualbox.vboxwebsrv.plist Support
User Login Items:
  Garmin Express Service
  iTunesHelper
  Dropbox
  Android File Transfer Agent
Internet Plug-ins:
  WidevineMediaOptimizer: Version: 6.0.0.12607 - SDK 10.7 Support
  FlashPlayer-10.6: Version: 14.0.0.145 - SDK 10.6 Support
  Default Browser: Version: 537 - SDK 10.9
  Flash Player: Version: 14.0.0.145 - SDK 10.6 Support
  CouponPrinter-FireFox_v2: Version: Version 1.1.9 - SDK 10.5 Support
  QuickTime Plugin: Version: 7.7.3
  CitrixICAClientPlugIn: Version: 11.7.0 - SDK 10.7 Support
  OfficeLiveBrowserPlugin: Version: 12.3.5 Support
  GarminGpsControl: Version: 4.0.4.0 Release - SDK 10.6 Support
  iPhotoPhotocast: Version: 7.0
Audio Plug-ins:
  BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
  AirPlay: Version: 2.0 - SDK 10.9
  AppleAVBAudio: Version: 203.2 - SDK 10.9
  iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
  Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes:
  Citrix ShareFile Sync  Support
  Flash Player  Support
Time Machine:
  Time Machine not configured!
Top Processes by CPU:
      7% WindowServer
      2% Dock
      0% fontd
      0% HP Device Monitor
      0% dpd
Top Processes by Memory:
  156 MB mds_stores
  152 MB com.apple.WebKit.WebContent
  147 MB com.apple.IconServicesAgent
  127 MB softwareupdated
  82 MB Finder
Virtual Memory Information:
  600 MB Free RAM
  2.05 GB Active RAM
  861 MB Inactive RAM
  537 MB Wired RAM
  3.72 GB Page-ins
  0 B Page-outs

Answer 1

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.