Multiple kernel panic errors after upgrading to snow leopard 10.6.8 on my MacBook Pro.

After upgrading to 10.6.8, I almost immediately began experiencing multiple random kernel panic errors.  I reinstalled the operating system that came with my notebook from the cd (10.6?) and the problem went away.  I upgraded again to 10.6.8 and again began experiencing the same error.  I have since gone back and installed the operating syatem from the cd and then upgraded to 10.6.7.  I have not had a single kernel panic error since, but I would like to upgrade to 10.6.8 so that I can install Lion when it is avaialable.  Any thoughts as to how I can do this without experiencing all of the accompanying kernel panic errors?

Thank you.  The log is below:
Anonymous UUID:                    CC4821C8-35CD-469C-BE4C-98F1DE35B903
Sun Jun 26 21:18:00 2011
Machine-check capabilities (cpu 3) 0x0000000000000c09:
family: 6 model: 37 stepping: 2 microcode: 9
Intel(R) Core(TM) i5 CPU       M 540  @ 2.53GHz
9 error-reporting banks
threshold-based error status present
extended corrected memory error handling present
Machine-check status 0x0000000000000004:
machine-check in progress
MCA error-reporting registers:
IA32_MC0_STATUS(0x401): 0x0000000000000800 invalid
IA32_MC1_STATUS(0x405): 0x0000000000000000 invalid
IA32_MC2_STATUS(0x409): 0xb200000000020005 valid
  MCA error code:            0x0005
  Model specific error code: 0x0002
  Other information:         0x00000000
  Threshold-based status:    No tracking
  Status bits:
   Processor context corrupt
   Error enabled
   Uncorrected error
IA32_MC3_STATUS(0x40d): 0x0000000000000000 invalid
IA32_MC4_STATUS(0x411): 0x0000000000000000 invalid
IA32_MC5_STATUS(0x415): 0x0000000000000000 invalid
IA32_MC6_STATUS(0x419): 0x0000000000000000 invalid
IA32_MC7_STATUS(0x41d): 0x0000000000000000 invalid
Package 0 logged:
IA32_MC8_STATUS(0x421): 0x0000000000000000 invalid
panic(cpu 3 caller 0x2aaf41): Machine Check at 0x002b1eb9, thread:0x85833d4, trapno:0x12, err:0x0,registers:
CR0: 0x8001003b, CR2: 0x02282868, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x000100de, EBX: 0x00000630, ECX: 0x00000000, EDX: 0x7fffffff
ESP: 0x5c82bd28, EBP: 0x5c82bd28, ESI: 0x00000000, EDI: 0x5501e0a8
EFL: 0x00000002, EIP: 0x002b1eb9
Backtrace (CPU 3), Frame : Return Address (4 potential args on stack)
0x550b8fb8 : 0x21b837 (0x5dd7fc 0x550b8fec 0x223ce1 0x0)
0x550b9008 : 0x2aaf41 (0x59dfe4 0x59e0d1 0x2b1eb9 0x85833d4)
0x550b90f8 : 0x2a29f2 (0x1 0x3b40c858 0xfffd9085 0x83077fff)
0x5c82bd28 : 0x2b2124 (0x32 0x0 0x0 0x0)
0x5c82bd48 : 0x11f1db7 (0x5501e0a8 0xffffffff 0x7fffffff 0xffffffff)
0x5c82be28 : 0x11f3850 (0xffffffff 0x7fffffff 0x0 0x0)
0x5c82bf28 : 0x2ad0c5 (0xffffffff 0x7fffffff 0x10 0x202)
0x5c82bf48 : 0x225bba (0x0 0x4ffad2b2 0xd5 0x5502d488)
0x5c82bfa8 : 0x22810b (0x85833d4 0x2280f4 0x0 0x8c57764)
0x5c82bfc8 : 0x2a179c (0x0 0xffffffff 0x10 0xa1f1064)
      Kernel Extensions in backtrace (with dependencies):
         com.apple.driver.AppleIntelCPUPowerManagement(142.6.0)@0x11f0000->0x1213fff
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K540
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: 916750825314
unloaded kexts:
com.apple.driver.AppleUSBUHCI    4.2.0 (addr 0x142d000, size 0x65536) - last unloaded 138176310496
loaded kexts:
com.Symantec.kext.SAVAPComm    11.0.6 - last loaded 30941770731
com.apple.driver.AppleHWSensor    1.9.3d0
com.apple.filesystems.autofs    2.1.0
com.apple.driver.AGPM    100.12.31
com.apple.filesystems.ntfs    3.4
com.apple.driver.AppleMikeyHIDDriver    1.2.0
com.apple.driver.AppleMikeyDriver    2.0.5f13
com.apple.driver.AppleUpstreamUserClient    3.5.7
com.apple.driver.AppleMCCSControl    1.0.20
com.apple.driver.AppleHDA    2.0.5f13
com.apple.driver.AudioAUUC    1.57
com.apple.driver.AppleIntelHDGraphics    6.3.6
com.apple.driver.AppleIntelHDGraphicsFB    6.3.6
com.apple.driver.SMCMotionSensor    3.0.1d2
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AudioIPCDriver    1.1.6
com.apple.driver.ACPI_SMC_PlatformPlugin    4.7.0a1
com.apple.GeForce    6.3.6
com.apple.driver.AppleGraphicsControl    2.10.6
com.apple.driver.AppleLPC    1.5.1
com.apple.kext.AppleSMCLMU    1.5.2d10
com.apple.driver.AppleUSBTCButtons    201.6
com.apple.driver.AppleUSBCardReader    2.6.1
com.apple.driver.AppleIRController    303.8
com.apple.driver.AppleUSBTCKeyboard    201.6
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.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    2.1.12
com.apple.driver.AppleIntelCPUPowerManagement    142.6.0
com.apple.driver.AppleProfileReadCounterAction    17
com.apple.driver.DspFuncLib    2.0.5f13
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.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.driver.AppleHDAController    2.0.5f13
com.apple.iokit.IOHDAFamily    2.0.5f13
com.apple.iokit.AppleProfileFamily    41
com.apple.driver.IOPlatformPluginFamily    4.7.0a1
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.driver.AppleBacklightExpert    1.0.1
com.apple.driver.AppleSMC    3.1.0d5
com.apple.nvidia.nv50hal    6.3.6
com.apple.NVDAResman    6.3.6
com.apple.iokit.IONDRVSupport    2.2
com.apple.iokit.IOGraphicsFamily    2.2
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.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
System Profile:
Model: MacBookPro6,2, BootROM MBP61.0057.B0C, 2 processors, Intel Core i5, 2.53 GHz, 4 GB, SMC 1.58f15
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.10.131.36.9)
Bluetooth: Version 2.4.0f1, 2 service, 19 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: ST9500325ASG, 465.76 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfd100000
USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8507, 0xfd110000
USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0xfd120000
USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfa100000
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac  (Apple Inc.), 0x0236, 0xfa120000
USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000
USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8218, 0xfa113000
USB Device: Internal Memory Card Reader, 0x05ac  (Apple Inc.), 0x8403, 0xfa130000

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