My Mac Pro keeps crashing

Every once in a while my Mac Pro crashes and the screen just turns into a bunch of vertical cream colored bars. Any help would be very much apriciated.
Thank you
Error message:
Interval Since Last Panic Report:  215528 sec
Panics Since Last Report:          1
Anonymous UUID:                    463145E6-2C48-4D7F-9C80-4E103FE0840A
Sun Apr 20 15:43:20 2014
panic(cpu 0 caller 0x2b1391): "TLB invalidation IPI timeout: " "CPU(s) failed to respond to interrupts, unresponsive CPU bitmap: 0xc, NMIPI acks: orig: 0x0, now: 0x0"@/SourceCache/xnu/xnu-1699.32.7/osfmk/i386/pmap.c:3024
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x84903c18 : 0x2203de (0x6b08cc 0x84903c38 0x229fb0 0x0)
0x84903c48 : 0x2b1391 (0x6b8eec 0xc 0x0 0x0)
0x84903c98 : 0x2b4cd1 (0x867960 0x8356f000 0x0 0x83573000)
0x84903d18 : 0x2b53dc (0x867960 0x8356f000 0x0 0xfec1ab78)
0x84903d58 : 0x2789cf (0x867960 0x8356f000 0x0 0x83573000)
0x84903e18 : 0x279a65 (0x0 0x83573000 0x0 0x1)
0x84903e48 : 0x27231d (0x2a5af3c 0x8356f000 0x0 0x83573000)
0x84903e78 : 0x588112 (0x2a5af3c 0x8356f000 0x4000 0x1247a7d8)
0x84903e98 : 0x5883bb (0xdff8dd0 0x400 0x84903eb8 0x227fbd)
0x84903ec8 : 0x588443 (0x100a3660 0x10690ab8 0x84903ee8 0x2452d9)
0x84903ee8 : 0x55645f (0xea88b6c 0x84903f08 0x84903f38 0x5556c4)
0x84903f38 : 0x5574d2 (0xeb4bdd0 0xea88b6c 0x100a3660 0x1)
0x84903f68 : 0x5575d6 (0xeb4bdd0 0x0 0x8356f000 0x10690a74)
0x84903f88 : 0x5f355b (0x100a3660 0x10690a74 0x10690ab8 0x18)
0x84903fc8 : 0x2e5a97 (0x10ae0bd0 0x1 0x10 0xe764750)
BSD process name corresponding to current thread: Dropbox
Mac OS version:
11G63b
Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:26:45 PDT 2012; root:xnu-1699.32.7~1/RELEASE_I386
Kernel UUID: 859B45FB-14BB-35ED-B823-08393C63E13B
System model name: MacPro1,1 (Mac-F4208DC8)
System uptime in nanoseconds: 12889270131486
last loaded kext at 1438267046138: com.apple.driver.IOBluetoothHIDDriver          4.0.8f17 (addr 0x10b4000, size 69632)
loaded kexts:
com.apple.filesystems.msdosfs          1.7.1
com.apple.driver.AppleUSBCDC          4.1.22
com.apple.filesystems.smbfs          1.7.2
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleHDAHardwareConfigDriver          2.2.5a5
com.apple.iokit.IOBluetoothSerialManager          4.0.8f17
com.apple.driver.AppleUpstreamUserClient          3.5.9
com.apple.driver.AppleMCCSControl          1.0.33
com.apple.driver.AppleHDA          2.2.5a5
com.apple.kext.ATIFramebuffer          7.3.2
com.apple.driver.AppleTyMCEDriver          1.0.2d2
com.apple.driver.AudioAUUC          1.59
com.apple.ATIRadeonX3000          7.3.2
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AppleMCEDriver          1.1.9
com.apple.driver.AudioIPCDriver          1.2.3
com.apple.driver.ApplePolicyControl          3.1.33
com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d8
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.PioneerSuperDrive          3.0.6
com.apple.iokit.SCSITaskUserClient          3.2.1
com.apple.driver.XsanFilter          404
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          33
com.apple.iokit.IOAHCIBlockStorage          2.1.0
com.apple.driver.AppleUSBOHCI          5.1.0
com.apple.driver.AppleFWOHCI          4.9.0
com.apple.driver.AppleAHCIPort          2.3.1
com.apple.driver.AppleIntelPIIXATA          2.5.1
com.apple.driver.AirPortBrcm43224          501.36.15
com.apple.driver.AppleUSBHub          5.1.0
com.apple.driver.AppleIntel8254XEthernet          2.1.3b1
com.apple.driver.AppleEFINVRAM          1.6.1
com.apple.driver.AppleUSBEHCI          5.1.0
com.apple.driver.AppleUSBUHCI          5.1.0
com.apple.driver.AppleACPIButtons          1.5
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleHPET          1.7
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.5
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0
com.apple.nke.applicationfirewall          3.2.30
com.apple.security.quarantine          1.4
com.apple.security.TMSafetyNet          8
com.apple.driver.AppleIntelCPUPowerManagement          195.0.0
com.apple.driver.IOBluetoothHIDDriver          4.0.8f17
com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.1
com.apple.iokit.IOUSBMassStorageClass          3.0.3
com.apple.kext.triggers          1.0
com.apple.iokit.IOSerialFamily          10.0.5
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.driver.DspFuncLib          2.2.5a5
com.apple.kext.ATI5000Controller          7.3.2
com.apple.kext.ATISupport          7.3.2
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.driver.AppleUSBAudio          2.9.0f5
com.apple.iokit.IOSurface          80.0.2
com.apple.iokit.IOAudioFamily          1.8.6fc18
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.AppleHDAController          2.2.5a5
com.apple.iokit.IOHDAFamily          2.2.5a5
com.apple.driver.AppleGraphicsControl          3.1.33
com.apple.iokit.IONDRVSupport          2.3.4
com.apple.iokit.IOGraphicsFamily          2.3.4
com.apple.driver.AppleSMC          3.1.3d10
com.apple.driver.IOPlatformPluginLegacy          5.0.0d8
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.IOPlatformPluginFamily          5.1.1d6
com.apple.driver.AppleUSBMergeNub          5.1.0
com.apple.iokit.IOUSBHIDDriver          5.0.0
com.apple.driver.AppleFileSystemDriver          13
com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17
com.apple.iokit.IOBluetoothFamily          4.0.8f17
com.apple.driver.AppleUSBComposite          5.0.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.2.1
com.apple.iokit.IOBDStorageFamily          1.7
com.apple.iokit.IODVDStorageFamily          1.7.1
com.apple.iokit.IOCDStorageFamily          1.7.1
com.apple.iokit.IOATAPIProtocolTransport          3.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1
com.apple.iokit.IOFireWireFamily          4.4.8
com.apple.iokit.IOAHCIFamily          2.0.8
com.apple.iokit.IOATAFamily          2.5.1
com.apple.iokit.IO80211Family          420.3
com.apple.iokit.IOUSBUserClient          5.0.0
com.apple.iokit.IONetworkingFamily          2.1
com.apple.iokit.IOUSBFamily          5.1.0
com.apple.driver.AppleEFIRuntime          1.6.1
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          177.11
com.apple.kext.AppleMatch          1.0.0d1
com.apple.driver.DiskImages          331.7
com.apple.iokit.IOStorageFamily          1.7.2
com.apple.driver.AppleKeyStore          28.18
com.apple.driver.AppleACPIPlatform          1.5
com.apple.iokit.IOPCIFamily          2.7
com.apple.iokit.IOACPIFamily          1.4
Model: MacPro1,1, BootROM MP11.005C.B08, 4 processors, Dual-Core Intel Xeon, 3 GHz, 9 GB, SMC 1.7f10
Graphics: ATI Radeon HD 5770, ATI Radeon HD 5770, PCIe, 1024 MB
Memory Module: DIMM Riser A/DIMM 1, 512 MB, DDR2 FB-DIMM, 667 MHz, 0x80AD, 0x48594D5035363441373242503844322D5935
Memory Module: DIMM Riser A/DIMM 2, 512 MB, DDR2 FB-DIMM, 667 MHz, 0x80AD, 0x48594D5035363441373242503844322D5935
Memory Module: DIMM Riser B/DIMM 1, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x80AD, 0x475232444632474258384859363637510000
Memory Module: DIMM Riser B/DIMM 2, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x80AD, 0x475232444632474258384859363637510000
Memory Module: DIMM Riser A/DIMM 3, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x02FE, 0x47523244463536373238454C363637510000
Memory Module: DIMM Riser A/DIMM 4, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x02FE, 0x47523244463536373238454C363637510000
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x87), Broadcom BCM43xx 1.0 (5.10.131.36.15)
Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial ports
Network Service: Ethernet 2, Ethernet, en1
PCI Card: pcibdbd,a10c, sppci_video, [email protected],1,0
PCI Card: ATI Radeon HD 5770, sppci_displaycontroller, Slot-1
PCI Card: ATI Radeon HD 5770, ATY,VervetParent, Slot-1
PCI Card: pci1033,35, sppci_usbopenhost, [email protected],1,0
PCI Card: pci1033,35, sppci_usbopenhost, [email protected],1,1
PCI Card: pci1033,e0, USB Enhanced Host Controller, [email protected],1,2
PCI Card: pci104c,8025, sppci_ieee1394openhci, [email protected],2,0
Serial ATA Device: ST3250824AS  P, 250.06 GB
Serial ATA Device: WL300GBSATA, 300.07 GB
Parallel ATA Device: PIONEER DVD-RW  DVR-111D
USB Device: Generic USB Hub, 0x058f  (Alcor Micro, Corp.), 0x9254, 0x3d100000 / 2
USB Device: Hub in Apple Extended USB Keyboard, apple_vendor_id, 0x1003, 0x3d140000 / 4
USB Device: Apple Extended USB Keyboard, apple_vendor_id, 0x020b, 0x3d143000 / 5
USB Device: Generic USB Audio Device, 0x0d8c  (C-MEDIA ELECTRONICS INC.), 0x000e, 0x3d120000 / 3
USB Device: BCM2046B1, 0x0a5c  (Broadcom Corp.), 0x4500, 0x1d100000 / 2
USB Device: BCM92046DG-CL1ROM, 0x0a5c  (Broadcom Corp.), 0x2148, 0x1d130000 / 5
USB Device: composite_device, 0x0a5c  (Broadcom Corp.), 0x4502, 0x1d110000 / 4
USB Device: composite_device, 0x0a5c  (Broadcom Corp.), 0x4503, 0x1d120000 / 3
FireWire Device: built-in_hub, 800mbit_speed
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Reply

Hey there Neo96,
It sounds like your Lion installation is getting kernel panics every so often. I recommend the troubleshooting from the following article about troubleshooting those named:
OS X: About kernel panics
http://support.apple.com/kb/ts3742
For OS X Lion and earlier, follow these steps:
Press and hold the Power button for several seconds to turn off your Mac.
Turn on your Mac.
As soon as your Mac starts up, hold down the Shift key to start up with a Safe Boot into Safe Mode. Note: If you are using a third-party external keyboard and cannot start with a Safe Boot, try using an Apple keyboard instead.
If your Mac has another kernel panic starting up, or while in Safe Mode, go to the "Troubleshooting a recurring kernel panic" section below.
If your Mac starts up without a kernel panic after a Safe Boot, restart by choosing Apple menu () > Restart…, then let it start up normally.
Important: If the Mac has another kernel panic within a few weeks, refer to the "Troubleshooting a recurring kernel panic" section below.
Note: If the hardware and software on the Mac checks out as OK, yet recurring kernel panics still occur, it is possible that something on the network is sending the Mac malformed network packets. In these situations, check the devices on the network. Make sure the router's firmware is up-to-date, and that the router is functioning. Refer to the router's manufacturer for service and support.
Thank you for using Apple Support Communities.
All the best,
Sterling