Imac (early 2009) Slow, display issues and freezing, can anyone get any info from crash report?

Hi,
Just wondering if anyone can provide some insight into why my Imac is constintantly crashing.
Issue:
For as long as I can remember it has been ocassionally freezing. First there are little redish dots in clusters on parts of the screen, then if you move a window, some of the image of the window gets left behind. Then there are moving horozintal lines that come up from the bottom of the screen. You can move the mouse but it wont click on anything.
As of about 6 months ago they crashed became so frequent that sometimes you couldn't get 5 mins out of the computer before it would do it again.
I use photoshop quite a lot but the files are never extraordinaly large.
The top left part of the computer can become really hot.
In an effort to try to resolve it I rang Apple and they got to do something which made it work properly again for 2 days, long enough for me to decide to upgrade to Mavrick. Since upgrading it's been even worse. It's really really slow and in applications like mail its flashing and looking like it's loading the page over and over again, starting with the bottom of the page and the bottom colour. Mail searh is also not working. It then freezes again.
Mostly it freezes, and doesn' t crash so I have to restart it myself, so it's not reporting it as a crash.
Today it did crash, I was wondering if anyone can figure out whats wrong the the report below?
Thanks!
Wed Feb 12 14:22:04 2014
panic(cpu 0 caller 0xffffff7f88583552): NVRM[0/2:0:0]: Read Error 0x00001604: CFG 0x00000000 0x00006140 0x00006140, BAR0 0xd2000000 0xffffff80882d7000 0x094700a1, D0, P1/4
Backtrace (CPU 0), Frame : Return Address
0xffffff808760b650 : 0xffffff8007a22f69
0xffffff808760b6d0 : 0xffffff7f88583552
0xffffff808760b790 : 0xffffff7f8864fd9e
0xffffff808760b7d0 : 0xffffff7f888b3d54
0xffffff808760b810 : 0xffffff7f888a8eb7
0xffffff808760b850 : 0xffffff7f886c66ba
0xffffff808760b9a0 : 0xffffff7f886c5a3b
0xffffff808760bab0 : 0xffffff7f88885ed8
0xffffff808760bb60 : 0xffffff7f88886250
0xffffff808760bd00 : 0xffffff7f888cb20f
0xffffff808760be20 : 0xffffff7f88673d41
0xffffff808760be40 : 0xffffff7f8858a08d
0xffffff808760bef0 : 0xffffff8007eada80
0xffffff808760bf30 : 0xffffff8007eac522
0xffffff808760bf80 : 0xffffff8007eac5f7
0xffffff808760bfb0 : 0xffffff8007ad6aa7
      Kernel Extensions in backtrace:
         com.apple.nvidia.classic.NVDAResmanTesla(8.1.8)[0A1B6F41-168D-307A-BABD-162F3B3 C2786]@0xffffff7f88532000->0xffffff7f887a1fff
            dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7f880ba000
            dependency: com.apple.iokit.IONDRVSupport(2.3.6)[86BA68C6-18DD-30A1-ABF6-54597AD6C277]@0xff ffff7f88522000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0 xffffff7f884df000
         com.apple.nvidia.classic.NVDANV50HalTesla(8.1.8)[3666E0FC-87C7-3329-BD8C-2F1ADE D100A4]@0xffffff7f887ac000->0xffffff7f88a58fff
            dependency: com.apple.nvidia.classic.NVDAResmanTesla(8.1.8)[0A1B6F41-168D-307A-BABD-162F3B3 C2786]@0xffffff7f88532000
            dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff 7f880ba000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
13B42
Kernel version:
Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64
Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393
Kernel slide:     0x0000000007800000
Kernel text base: 0xffffff8007a00000
System model name: iMac9,1 (Mac-F2218FC8)
System uptime in nanoseconds: 1477295383230
last loaded kext at 277739752297: com.apple.filesystems.msdosfs          1.9 (addr 0xffffff7f89d7a000, size 65536)
last unloaded kext at 338692832769: com.apple.filesystems.msdosfs          1.9 (addr 0xffffff7f89d7a000, size 57344)
loaded kexts:
com.apple.driver.AudioAUUC          1.60
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.driver.AGPM          100.14.11
com.apple.filesystems.autofs          3.0
com.apple.iokit.IOBluetoothSerialManager          4.2.0f6
com.apple.driver.AppleMikeyHIDDriver          124
com.apple.driver.AppleHDA          2.5.3fc1
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.driver.AppleUpstreamUserClient          3.5.13
com.apple.driver.AppleMikeyDriver          2.5.3fc1
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
com.apple.driver.AppleLPC          1.7.0
com.apple.GeForceTesla          8.1.8
com.apple.driver.AppleHWAccess          1
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6
com.apple.driver.AppleBacklight          170.3.5
com.apple.driver.AppleMCCSControl          1.1.12
com.apple.iokit.SCSITaskUserClient          3.6.0
com.apple.driver.AppleIRController          325.7
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          35
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.4.0
com.apple.driver.AppleFWOHCI          4.9.9
com.apple.driver.AirPort.Brcm4331          700.20.22
com.apple.driver.AppleAHCIPort          2.9.5
com.apple.driver.AppleUSBHub          650.4.4
com.apple.nvenet          2.0.21
com.apple.driver.AppleUSBEHCI          650.4.1
com.apple.driver.AppleUSBOHCI          650.4.1
com.apple.driver.AppleRTC          2.0
com.apple.driver.AppleHPET          1.8
com.apple.driver.AppleACPIButtons          2.0
com.apple.driver.AppleSMBIOS          2.0
com.apple.driver.AppleACPIEC          2.0
com.apple.driver.AppleAPIC          1.7
com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
com.apple.nke.applicationfirewall          153
com.apple.security.quarantine          3
com.apple.driver.AppleIntelCPUPowerManagement          216.0.0
com.apple.AppleGraphicsDeviceControl          3.4.12
com.apple.kext.triggers          1.0
com.apple.iokit.IOSerialFamily          10.0.7
com.apple.driver.DspFuncLib          2.5.3fc1
com.apple.vecLib.kext          1.0.0
com.apple.iokit.IOAudioFamily          1.9.4fc11
com.apple.kext.OSvKernDSPLib          1.14
com.apple.iokit.IOSurface          91
com.apple.iokit.IOBluetoothFamily          4.2.0f6
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.AppleSMBusPCI          1.0.12d1
com.apple.driver.IOPlatformPluginFamily          5.5.1d27
com.apple.nvidia.classic.NVDANV50HalTesla          8.1.8
com.apple.driver.AppleSMC          3.1.6d1
com.apple.nvidia.classic.NVDAResmanTesla          8.1.8
com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.driver.AppleHDAController          2.5.3fc1
com.apple.iokit.IOHDAFamily          2.5.3fc1
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.driver.AppleSMBusController          1.0.11d1
com.apple.iokit.IONDRVSupport          2.3.6
com.apple.iokit.IOGraphicsFamily          2.3.6
com.apple.driver.AppleUSBHIDMouse          180.9
com.apple.driver.AppleHIDMouse          180.9
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.6.0
com.apple.iokit.IOBDStorageFamily          1.7
com.apple.iokit.IODVDStorageFamily          1.7.1
com.apple.iokit.IOCDStorageFamily          1.7.1
com.apple.driver.AppleUSBHIDKeyboard          170.15
com.apple.driver.AppleHIDKeyboard          170.15
com.apple.iokit.IOUSBHIDDriver          650.4.4
com.apple.iokit.IOAHCISerialATAPI          2.6.0
com.apple.driver.AppleUSBMergeNub          650.4.0
com.apple.driver.AppleUSBComposite          650.4.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
com.apple.iokit.IOFireWireFamily          4.5.5
com.apple.iokit.IO80211Family          600.34
com.apple.iokit.IOAHCIFamily          2.6.0
com.apple.iokit.IOUSBUserClient          650.4.4
com.apple.iokit.IONetworkingFamily          3.2
com.apple.iokit.IOUSBFamily          650.4.4
com.apple.driver.NVSMU          2.2.9
com.apple.driver.AppleEFINVRAM          2.0
com.apple.driver.AppleEFIRuntime          2.0
com.apple.iokit.IOHIDFamily          2.0.0
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          278.10
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.AppleKeyStore          2
com.apple.driver.DiskImages          371.1
com.apple.iokit.IOStorageFamily          1.9
com.apple.iokit.IOReportFamily          21
com.apple.driver.AppleFDEKeyStore          28.30
com.apple.driver.AppleACPIPlatform          2.0
com.apple.iokit.IOPCIFamily          2.8
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0
com.apple.kec.pthread          1
Model: iMac9,1, BootROM IM91.008D.B08, 2 processors, Intel Core 2 Duo, 3.06 GHz, 4 GB, SMC 1.37f3
Graphics: NVIDIA GeForce GT 130, NVIDIA GeForce GT 130, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334448312D4346382020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334448312D4346382020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.106.98.100.22)
Bluetooth: Version 4.2.0f6 12982, 3 services, 15 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: WDC WD1001FALS-40K1B0, 1 TB
Serial ATA Device: PIONEER DVD-RW  DVRTS08
USB Device: Built-in iSight
USB Device: Keyboard Hub
USB Device: Apple Optical USB Mouse
USB Device: Apple Keyboard
USB Device: IR Receiver
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus:

This is a Kernel Panic report, I cannot see any software related issues, my bst guess it's related to hardware. Common causes of hardware related KPs are RAM
Incorrect RAM
Failed RAM
Unseated RAM
Eliminate each and then re-test. If it's not RAM it could be a failing HD or something else. I would recommend taking the machine in to be looked at by a professional and tested. Take it to your local Apple Store or local AASP.

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