MacBook Prp Freezing

I am frequently getting this freeze on my MacBook Pro 10.6.8 - 2.66GHz i7 - any thoughts? ---> 
panic(cpu 2 caller 0xa80c9b): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xc0000000 0x80194000 0x0a5480a2, D0, P2/4

Here it is:
Fri Jan 10 10:51:03 2014
panic(cpu 2 caller 0xa80c9b): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xc0000000 0x80194000 0x0a5480a2, D0, P2/4
Backtrace (CPU 2), Frame : Return Address (4 potential args on stack)
0x6d1d9c38 : 0x21b837 (0x5dd7fc 0x6d1d9c6c 0x223ce1 0x0)
0x6d1d9c88 : 0xa80c9b (0xc9628c 0xd06800 0xca4e60 0x0)
0x6d1d9d28 : 0xb9b608 (0x9ad2c04 0x9871004 0x100 0x2746b000)
0x6d1d9d78 : 0xb92601 (0x9871004 0x100 0x6d1d9da8 0xa70778)
0x6d1d9da8 : 0x17119a6 (0x9871004 0x100 0x438004ee 0x0)
0x6d1d9ee8 : 0xbba2b5 (0x9871004 0x9880004 0x0 0x0)
0x6d1d9f28 : 0xa89e7c (0x9871004 0x9880004 0x0 0x0)
0x6d1d9fc8 : 0xa8655b (0x0 0x9 0x0 0x0)
0x6d1da178 : 0xa886e7 (0x0 0x600d600d 0x7027 0x6d1da1a8)
0x6d1da248 : 0xd3210d (0xc1d0004d 0xbeef0003 0xac25f80 0x71)
0x6d1da2e8 : 0xd32685 (0x4646b000 0xac25f80 0xac54804 0x0)
0x6d1da328 : 0xd09ec3 (0x4646b000 0xac25f80 0xac54804 0x0)
0x6d1da358 : 0xd31cba (0x4646b000 0xac25f80 0xac54804 0x0)
0x6d1da378 : 0xd09418 (0x4646b000 0xac25f80 0xac54804 0x0)
0x6d1da398 : 0xd32630 (0x4646b000 0xac54800 0x2 0x2)
0x6d1da3d8 : 0xd0c905 (0x4646b000 0xac54800 0x0 0xac52000)
0x6d1da418 : 0xd0a325 (0x4646b000 0x4666e000 0x464d8000 0x9023500)
0x6d1da468 : 0xd5d4e9 (0x4646b000 0x4666e000 0x464d8000 0x9023500)
0x6d1da4f8 : 0xd4ec9b (0x9023500 0xac52000 0x0 0x1)
0x6d1da558 : 0xd4ef02 (0x4666e000 0x4666e788 0xac52000 0x0)
0x6d1da5a8 : 0xd4f3d6 (0x4666e000 0x4666e788 0x6d1da8cc 0x6d1da86c)
0x6d1da8e8 : 0xd4c1a1 (0x4666e000 0x4666e788 0x1 0x2209aa)
0x6d1da908 : 0xd1388f (0x4666e000 0x4666e788 0xb12c180 0x507617)
0x6d1da938 : 0xd4dc64 (0x4666e000 0x6d1daa7c 0x6d1da968 0x4666e000)
0x6d1da978 : 0xd17c93 (0x4666e000 0x6d1daa7c 0x6d1daa7c 0x6d1da9e0)
0x6d1daab8 : 0xd515d8 (0x4666e000 0x1 0x6d1dabcc 0x6d1dabc8)
0x6d1dab68 : 0xd13fe1 (0x4666e000 0x1 0x6d1dabcc 0x6d1dabc8)
0x6d1dabe8 : 0x56da06 (0x4666e000 0x0 0x6d1dae3c 0x6d1dac74)
0x6d1dac38 : 0x56e2a5 (0xda2720 0x4666e000 0xabf2c88 0x1)
0x6d1dac88 : 0x56eb59 (0x4666e000 0x10 0x6d1dacd0 0x0)
0x6d1dada8 : 0x286638 (0x4666e000 0x10 0xabf2c88 0x1)
0x6d1dbe58 : 0x21dbe5 (0xabf2c60 0xaeaf5a0 0x1fd7e8 0x5e43)
0x6d1dbe98 : 0x210a86 (0xabf2c00 0x0 0x9436cb0 0xa003310)
0x6d1dbef8 : 0x216f84 (0xabf2c00 0x0 0x0 0x0)
0x6d1dbf78 : 0x295c57 (0x91efdc8 0x0 0x0 0x0)
0x6d1dbfc8 : 0x2a256d (0x91efdc4 0x1 0x10 0x0)
      Kernel Extensions in backtrace (with dependencies):
         com.apple.GeForce(6.4.0)@0xd08000->0xdbefff
            dependency: com.apple.NVDAResman(6.4.0)@0xa1a000
            dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0xa0d000
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x966000
            dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0x9eb000
         com.apple.nvidia.nv50hal(6.4.0)@0x15db000->0x19effff
            dependency: com.apple.NVDAResman(6.4.0)@0xa1a000
         com.apple.NVDAResman(6.4.0)@0xa1a000->0xd07fff
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x966000
            dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0xa0d000
            dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0x9eb000
BSD process name corresponding to current thread: WindowServer
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: MacBookPro6,2 (Mac-F22586C8)
System uptime in nanoseconds: 95280354746
unloaded kexts:
(none)
loaded kexts:
com.parallels.kext.prl_vnic    5.0 9376.599993
com.parallels.kext.prl_netbridge    5.0 9376.599993
com.parallels.kext.prl_usb_connect    5.0 9376.599993
com.parallels.kext.prl_hid_hook    5.0 9376.599993
com.parallels.kext.prl_hypervisor    5.0 9376.599993
com.Cycling74.driver.Soundflower    1.4.2
com.pctools.iantivirus.kfs    1.0.1
com.Logitech.driver.HIDDevices    2.0.0
com.apple.driver.AppleBluetoothMultitouch    54.3 - last loaded 29592635924
com.apple.driver.AppleHWSensor    1.9.3d0
com.apple.driver.IOBluetoothSCOAudioDriver    2.4.5f3
com.apple.driver.InternalModemSupport    2.6.2
com.apple.filesystems.autofs    2.1.0
com.apple.driver.AppleTyMCEDriver    1.0.2d2
com.apple.driver.AGPM    100.12.31
com.apple.driver.AppleMikeyHIDDriver    1.2.0
com.apple.driver.AppleHDA    2.0.5f14
com.apple.driver.AppleMikeyDriver    2.0.5f14
com.apple.driver.AudioAUUC    1.57
com.apple.driver.AppleUpstreamUserClient    3.5.7
com.apple.driver.AppleMCCSControl    1.0.20
com.apple.driver.SMCMotionSensor    3.0.1d2
com.apple.driver.AppleIntelYonahProfile    14
com.apple.driver.AppleIntelPenrynProfile    17
com.apple.driver.AppleIntelNehalemProfile    11
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AudioIPCDriver    1.1.6
com.apple.driver.AppleGraphicsControl    2.10.6
com.apple.driver.AppleIntelMeromProfile    19
com.apple.driver.ACPI_SMC_PlatformPlugin    4.7.0a1
com.apple.driver.AppleLPC    1.5.1
com.apple.driver.AppleBacklight    170.0.46
com.apple.kext.AppleSMCLMU    1.5.2d10
com.apple.GeForce    6.4.0
com.apple.driver.AppleIntelHDGraphics    6.4.0
com.apple.driver.AppleIntelHDGraphicsFB    6.4.0
com.apple.driver.AppleUSBTCButtons    201.6
com.apple.driver.AppleUSBCardReader    2.6.1
com.apple.driver.AppleUSBTCKeyEventDriver    201.6
com.apple.driver.AppleUSBTCKeyboard    201.6
com.apple.driver.AppleIRController    303.8
com.apple.BootCache    31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.iokit.SCSITaskUserClient    2.6.8
com.apple.iokit.IOAHCIBlockStorage    1.6.4
com.apple.driver.AppleUSBHub    4.2.4
com.apple.driver.AppleFWOHCI    4.7.3
com.apple.driver.AirPortBrcm43224    428.42.4
com.apple.iokit.AppleBCM5701Ethernet    3.0.5b8
com.apple.driver.AppleEFINVRAM    1.4.0
com.apple.driver.AppleSmartBatteryManager    160.0.0
com.apple.driver.AppleAHCIPort    2.1.7
com.apple.driver.AppleUSBEHCI    4.2.4
com.apple.driver.AppleUSBUHCI    4.2.0
com.apple.driver.AppleACPIButtons    1.3.6
com.apple.driver.AppleRTC    1.3.1
com.apple.driver.AppleHPET    1.5
com.apple.driver.AppleSMBIOS    1.7
com.apple.driver.AppleACPIEC    1.3.6
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.IOBluetoothHIDDriver    2.4.5f3
com.apple.driver.AppleMultitouchDriver    207.11
com.apple.driver.AppleHDAHardwareConfigDriver    2.0.5f14
com.apple.driver.DspFuncLib    2.0.5f14
com.apple.driver.AppleProfileReadCounterAction    17
com.apple.driver.AppleProfileTimestampAction    10
com.apple.driver.AppleProfileThreadInfoAction    14
com.apple.driver.AppleProfileRegisterStateAction    10
com.apple.driver.AppleProfileKEventAction    10
com.apple.driver.AppleProfileCallstackAction    20
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.iokit.IOFireWireIP    2.0.3
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.iokit.IOSurface    74.2
com.apple.iokit.IOBluetoothSerialManager    2.4.5f3
com.apple.iokit.IOSerialFamily    10.0.3
com.apple.iokit.IOAudioFamily    1.8.3fc2
com.apple.kext.OSvKernDSPLib    1.3
com.apple.iokit.AppleProfileFamily    41
com.apple.driver.IOPlatformPluginFamily    4.7.0a1
com.apple.driver.AppleHDAController    2.0.5f14
com.apple.iokit.IOHDAFamily    2.0.5f14
com.apple.driver.AppleBacklightExpert    1.0.1
com.apple.driver.AppleSMC    3.1.0d5
com.apple.nvidia.nv50hal    6.4.0
com.apple.NVDAResman    6.4.0
com.apple.iokit.IONDRVSupport    2.2.1
com.apple.iokit.IOGraphicsFamily    2.2.1
com.apple.driver.BroadcomUSBBluetoothHCIController    2.4.5f3
com.apple.driver.AppleUSBBluetoothHCIController    2.4.5f3
com.apple.iokit.IOBluetoothFamily    2.4.5f3
com.apple.iokit.IOSCSIBlockCommandsDevice    2.6.8
com.apple.iokit.IOUSBMassStorageClass    2.6.7
com.apple.driver.AppleUSBMultitouch    207.7
com.apple.iokit.IOUSBHIDDriver    4.2.0
com.apple.driver.AppleFileSystemDriver    2.0
com.apple.driver.AppleUSBMergeNub    4.2.4
com.apple.driver.AppleUSBComposite    3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice    2.6.8
com.apple.iokit.IOBDStorageFamily    1.6
com.apple.iokit.IODVDStorageFamily    1.6
com.apple.iokit.IOCDStorageFamily    1.6.1
com.apple.driver.XsanFilter    402.1
com.apple.iokit.IOAHCISerialATAPI    1.2.6
com.apple.iokit.IOSCSIArchitectureModelFamily    2.6.8
com.apple.iokit.IOFireWireFamily    4.2.6
com.apple.iokit.IOUSBUserClient    4.2.4
com.apple.iokit.IO80211Family    320.1
com.apple.iokit.IONetworkingFamily    1.10
com.apple.iokit.IOAHCIFamily    2.0.6
com.apple.iokit.IOUSBFamily    4.2.4
com.apple.driver.AppleEFIRuntime    1.4.0
com.apple.iokit.IOHIDFamily    1.6.6
com.apple.iokit.IOSMBusFamily    1.1
com.apple.kext.AppleMatch    1.0.0d1
com.apple.security.TMSafetyNet    6
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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