Mac Pro crashes and turns itself off

Hello, hope someone can help me!
I have a 2008 Mac Pro and recently it's been crashing and restarting itself. The first two times it crashed it wouldn't restart so I took it to the Genius bar where they had it for a total of 6 days running various tests to try and get the problem to happen again and testing all the hardware, Disks, RAM, Graphics card etc but they couldn't find a problem!
The last time I took it to the Genius bar they reinstalled the system and when it crashed yesterday I was able to get it to restart and it's now running again. I was able to get a crash report (see below) from when it crashed yesterday and hopefully there's someone out there who can decipher this and see what the problem was?
Interval Since Last Panic Report: 577038 sec
Panics Since Last Report:          2
Anonymous UUID:                    AAF84E9C-DB98-5B66-4879-626CF5B74DB4
Wed Feb 13 11:42:48 2013
panic(cpu 4 caller 0xffffff800b8b7bd5): Kernel trap at 0xffffff7f8da2821e, type 13=general protection, registers:
CR0: 0x0000000080010033, CR2: 0x000000010d214770, CR3: 0x00000001aeb3d000, CR4: 0x0000000000000660
RAX: 0x0000000000000000, RBX: 0x05058d48e5894855, RCX: 0x0000000000000000, RDX: 0x0000000000000000
RSP: 0xffffff80f4513d20, RBP: 0xffffff80f4513d30, RSI: 0x000000002c977ae8, RDI: 0xffffff802daead88
R8: 0xffffff80f4565078, R9: 0x7ffffffffffffffe, R10: 0x00000000ffffffff, R11: 0x00000000ffffff80
R12: 0xffffff80f4513dc7, R13: 0x0000000000000000, R14: 0x0000000000000000, R15: 0xffffff8021852070
RFL: 0x0000000000010206, RIP: 0xffffff7f8da2821e, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x000000010d214770, Error code: 0x0000000000000000, Fault CPU: 0x4
Backtrace (CPU 4), Frame : Return Address
0xffffff80f45139c0 : 0xffffff800b81d626
0xffffff80f4513a30 : 0xffffff800b8b7bd5
0xffffff80f4513c00 : 0xffffff800b8ce4ed
0xffffff80f4513c20 : 0xffffff7f8da2821e
0xffffff80f4513d30 : 0xffffff7f8da28452
0xffffff80f4513d50 : 0xffffff7f8da285ee
0xffffff80f4513d80 : 0xffffff7f8da278fa
0xffffff80f4513e00 : 0xffffff800bbb1c24
0xffffff80f4513e40 : 0xffffff800bb977aa
0xffffff80f4513e80 : 0xffffff800bba0090
0xffffff80f4513f50 : 0xffffff800bbe182a
0xffffff80f4513fb0 : 0xffffff800b8ced33
      Kernel Extensions in backtrace:
         com.intego.kext.VirusBarrier.AppBarrierKPI(10.6.13)[20EED087-D04B-9B24-B745-75F A012BBD2A]@0xffffff7f8da27000->0xffffff7f8da29fff
BSD process name corresponding to current thread: WebProcess
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: 69A5853F-375A-3EF4-9247-478FD0247333
Kernel slide:     0x000000000b600000
Kernel text base: 0xffffff800b800000
System model name: MacPro3,1 (Mac-F42C88C8)
System uptime in nanoseconds: 9387153888614
last loaded kext at 51772157201: com.intego.iokit.VirusBarrierX6Service          10.6.13 (addr 0xffffff7f8da35000, size 36864)
last unloaded kext at 182103314479: com.apple.driver.AppleFileSystemDriver          3.0.1 (addr 0xffffff7f8d819000, size 8192)
loaded kexts:
com.intego.iokit.VirusBarrierX6Service          10.6.13
com.intego.iokit.VBX6NKE          1
com.intego.iokit.BehavioralKext          1
com.intego.kext.VirusBarrier.AppBarrierKPI          10.6.13
com.intego.kext.VirusBarrierKPI          10.6.13
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.driver.AudioAUUC          1.60
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleUSBDisplays          353
com.apple.driver.AppleHDA          2.3.1f2
com.apple.driver.AppleUpstreamUserClient          3.5.10
com.apple.driver.AppleMCCSControl          1.0.33
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.iokit.IOBluetoothSerialManager          4.0.9f33
com.apple.iokit.CSRBluetoothHCIControllerUSBTransport          4.0.9f33
com.apple.GeForce          8.0.0
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.ApplePolicyControl          3.2.11
com.apple.driver.AppleMCEDriver          1.1.9
com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
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.AppleIntel8254XEthernet          3.1.1b1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          34
com.apple.driver.AppleAHCIPort          2.4.1
com.apple.driver.AirPortBrcm43224          600.36.17
com.apple.driver.AppleIntelPIIXATA          2.5.1
com.apple.driver.AppleFWOHCI          4.9.6
com.apple.driver.AppleUSBEHCI          5.4.0
com.apple.driver.AppleUSBUHCI          5.2.5
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.kext.triggers          1.0
com.apple.driver.DspFuncLib          2.3.1f2
com.apple.iokit.IOAudioFamily          1.8.9fc10
com.apple.kext.OSvKernDSPLib          1.6
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.iokit.IOSurface          86.0.3
com.apple.iokit.IOSerialFamily          10.0.6
com.apple.iokit.IOBluetoothFamily          4.0.9f33
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.0.9f33
com.apple.driver.AppleHDAController          2.3.1f2
com.apple.iokit.IOHDAFamily          2.3.1f2
com.apple.nvidia.nv50hal          8.0.0
com.apple.NVDAResman          8.0.0
com.apple.driver.AppleGraphicsControl          3.2.11
com.apple.iokit.IONDRVSupport          2.3.5
com.apple.iokit.IOGraphicsFamily          2.3.5
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.driver.AppleSMC          3.1.4d2
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.IOPlatformPluginFamily          5.2.0d16
com.apple.driver.AppleUSBHIDKeyboard          165.5
com.apple.driver.AppleHIDKeyboard          165.5
com.apple.iokit.IOUSBHIDDriver          5.2.5
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.IOATAPIProtocolTransport          3.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.1
com.apple.iokit.IOUSBUserClient          5.2.5
com.apple.iokit.IOAHCIFamily          2.2.1
com.apple.iokit.IO80211Family          500.15
com.apple.iokit.IONetworkingFamily          3.0
com.apple.iokit.IOATAFamily          2.5.1
com.apple.iokit.IOFireWireFamily          4.5.5
com.apple.iokit.IOUSBFamily          5.4.0
com.apple.iokit.IOHIDFamily          1.8.0
com.apple.driver.AppleEFIRuntime          1.6.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          220
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          344
com.apple.iokit.IOStorageFamily          1.8
com.apple.driver.AppleKeyStore          28.21
com.apple.driver.AppleACPIPlatform          1.6
com.apple.iokit.IOPCIFamily          2.7.2
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0
Model: MacPro3,1, BootROM MP31.006C.B05, 8 processors, Quad-Core Intel Xeon, 3 GHz, 8 GB, SMC 1.25f4
Graphics: NVIDIA GeForce 8800 GT, NVIDIA GeForce 8800 GT, PCIe, 512 MB
Memory Module: DIMM Riser B/DIMM 1, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x3138484631323837324A4438304544364434
Memory Module: DIMM Riser B/DIMM 2, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x3138484631323837324A4438304544364434
Memory Module: DIMM Riser A/DIMM 1, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x3138484631323837324A4438304544364434
Memory Module: DIMM Riser A/DIMM 2, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x3138484631323837324A4438304544364434
Memory Module: DIMM Riser A/DIMM 3, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x0D9B, 0x000000000000000000000000000000000000
Memory Module: DIMM Riser A/DIMM 4, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x0D9B, 0x000000000000000000000000000000000000
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x88), Broadcom BCM43xx 1.0 (5.10.131.36.16)
Bluetooth: Version 4.0.9f33 10885, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en2
Network Service: Built-in Ethernet, Ethernet, en0
PCI Card: NVIDIA GeForce 8800 GT, sppci_displaycontroller, Slot-1
Serial ATA Device: ST3320820AS_P, 320.07 GB
Serial ATA Device: WDC WD5000AAKS-41YGA0, 500.11 GB
Serial ATA Device: WDC WD5000AAKS-41YGA0, 500.11 GB
Parallel ATA Device: OPTIARC DVD RW AD-7170A
USB Device: hub_device, apple_vendor_id, 0x911c, 0xfd500000 / 2
USB Device: Keyboard Hub, apple_vendor_id, 0x1006, 0xfd530000 / 4
USB Device: Apple Keyboard, apple_vendor_id, 0x0221, 0xfd532000 / 5
USB Device: Apple Cinema HD Display, apple_vendor_id, 0x921c, 0xfd520000 / 3
USB Device: PTZ-930, 0x056a (WACOM Co., Ltd.), 0x00b2, 0x3d100000 / 2
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8206, 0x5d200000 / 2
FireWire Device: built-in_hub, 800mbit_speed
FireWire Device: unknown_device, unknown_speed
If anyone can tell me what's causing the problem I'd be most grateful.
Many thanks,
Chris

Your wounds are completely self-inflicted:
The crash was deliberately caused by:
Kernel Extensions in backtrace:
         com.intego.kext.VirusBarrier.AppBarrierKPI(10.6.13)
You need to remove these extensions by un-Installing Intego Virus barrier.
com.intego.iokit.VirusBarrierX6Service          10.6.13
com.intego.iokit.VBX6NKE          1
com.intego.iokit.BehavioralKext          1
com.intego.kext.VirusBarrier.AppBarrierKPI          10.6.13
com.intego.kext.VirusBarrierKPI          10.6.13
I recommend Thomas A Reed's Mac Malware Guide:
http://www.reedcorner.net/mmg/

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So I did the on switch turn off/turn on routine and as soon as anything shows on the screen, I've got these black + white horizontal bars/stripes along the top 1/4 of my screen. The Apple Logo and the spinning progress bar have little fuzzy red spots on 'em. That's when it's time to freak out, as we're in "my computer done broke itself" territory. A few seconds of fuzzy progress bar and we get the wonderful "You need to restart your computer" message.
Fine.. restart.. same thing.
Reset the PRAM and SMC. Same thing.
Can't start up from external disks.. it just gives the same stripes + message.
I'm running a detailed hardware test (the hardware test loads but with the same stripes at the top and annoying blue/red vertical ones in the background to boot), and it's been running for about 80 minutes and is only 60% of the way through.
Anything else I can do, or do I have to drag the heavy thing to an Apple store and leave it there for a month? How in the world does a computer go from "working fine" to "completely broken" in 10 minutes?

More details:
The regular/non-extended Hardware Test returned no problems, despite taking hours for what was supposed to be a 3-5 minute test. I haven't dared run the extended.
I also tried removing third-party RAM and using the original configuration, then just the third-party and no Apple, etc.. It's not the RAM, as the problem is exactly the same.
I'm going to call up Apple support when I can, but just looking for other things I can check or possibly do until then, or just insight on what the problem could be.
Is it most likely the graphics card? Could it be an issue with the core hardware?

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