Kernel panic report help 10.6.8

Question

Hey everyone,
I know this is a common issue, so I apologize if there is a more appropriate place to post this. My 2008 Macbook core 2 duo has been giving me the gray lock up screen for about a year now, and I'm not sure why. Here is the panic report from the last time it happened (today). I haven't seen a correlation to anything specific, but possibly when downloading larger files. I've switched browsers and reset them. I also replaced the two 1gig ram sticks with 2 gig's.
Tue Apr  2 20:46:21 2013
panic(cpu 1 caller 0x226ec0): "thread_invoke: preemption_level -1, possible cause: unlocking an unlocked mutex or spinlock"@/SourceCache/xnu/xnu-1504.15.3/osfmk/kern/sched_prim.c:1471
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0xb5bb08 : 0x21b837 (0x5dd7fc 0xb5bb3c 0x223ce1 0x0)
0xb5bb58 : 0x226ec0 (0x593ab8 0xffffffff 0x593a50 0x226aa1)
0xb5bbd8 : 0x2275c6 (0xb9cf01c 0xb9cf01c 0xb5bc38 0x233203)
0xb5bc48 : 0x227654 (0x0 0x0 0x0 0x0)
0xb5bc68 : 0x221d42 (0x0 0x0 0x0 0x0)
0xb5bc88 : 0x490daa (0x8dc1a98 0x1 0x8dc1b04 0x0)
0xb5bcf8 : 0x49149d (0x0 0x0 0x0 0x8dc1a98)
0xb5bd38 : 0x2e2a41 (0x8dc1b04 0x8dc1a98 0x411 0x5a250d)
0xb5bd98 : 0x2d7b6b (0x8dc1a98 0x0 0x0 0x0)
0xb5bdf8 : 0x2d7bca (0x8dc1a98 0x4 0x0 0x0)
0xb5be18 : 0x446d09 (0x8dc1a98 0x4 0x1 0xb5bf54)
0xb5bea8 : 0x44731b (0x8dc1a98 0x1 0x0 0x83fc000)
0xb5bed8 : 0x2fc945 (0xb5befc 0x46fc6e6 0x0 0x0)
0xb5bf28 : 0x2e9342 (0x8dc1a98 0x1 0x1138f654 0xb5bf5c)
0xb5bf78 : 0x4f7f90 (0x83fc000 0x1138f550 0x1138f594 0xbfffdda4)
0xb5bfc8 : 0x2a1fd8 (0xb91e6c0 0x0 0x10 0xb91db84)
BSD process name corresponding to current thread: SecureDownloadMa
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: MacBook4,1 (Mac-F22788A9)
System uptime in nanoseconds: 17692349645132
unloaded kexts:
com.apple.driver.IOBluetoothHIDDriver          2.4.5f3 (addr 0x567f1000, size 0x53248) - last unloaded 13392439610566
loaded kexts:
com.Symantec.kext.SAVAPComm          10.2.0
com.cisco.nke.ipsec          2.0.1
com.apple.filesystems.autofs          2.1.0
com.apple.driver.AppleHDA          2.0.5f14
com.apple.driver.AppleHWSensor          1.9.3d0
com.apple.driver.AudioAUUC          1.57
com.apple.driver.AppleBacklight          170.0.46
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.AppleLPC          1.5.1
com.apple.driver.AppleIntelPenrynProfile          17
com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0a1
com.apple.driver.AppleUpstreamUserClient          3.5.7
com.apple.driver.AppleMCCSControl          1.0.20
com.apple.driver.AppleIntelGMAX3100          6.3.6
com.apple.driver.AppleIntelGMAX3100FB          6.3.6
com.apple.driver.AppleUSBTrackpad          201.6
com.apple.driver.AppleUSBTCKeyEventDriver          201.6
com.apple.driver.AppleUSBTCKeyboard          201.6
com.apple.driver.AppleIRController          303.8
com.apple.iokit.SCSITaskUserClient          2.6.8
com.apple.iokit.IOAHCIBlockStorage          1.6.4
com.apple.driver.AirPortBrcm43224          428.42.4
com.apple.BootCache          31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.driver.AppleFWOHCI          4.7.3
com.apple.driver.AppleSmartBatteryManager          160.0.0
com.apple.driver.AppleAHCIPort          2.1.7
com.apple.driver.AppleUSBHub          4.2.4
com.apple.driver.AppleIntelPIIXATA          2.5.1
com.apple.iokit.AppleYukon2          3.2.1b1
com.apple.driver.AppleUSBEHCI          4.2.4
com.apple.driver.AppleUSBUHCI          4.2.0
com.apple.driver.AppleEFINVRAM          1.4.0
com.apple.driver.AppleRTC          1.3.1
com.apple.driver.AppleHPET          1.5
com.apple.driver.AppleACPIButtons          1.3.6
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 - last loaded 16953254473574
com.apple.driver.AppleProfileReadCounterAction          17
com.apple.driver.DspFuncLib          2.0.5f14
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.AppleBacklightExpert          1.0.1
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          2.0.5f14
com.apple.iokit.IOHDAFamily          2.0.5f14
com.apple.iokit.AppleProfileFamily          41
com.apple.driver.IOPlatformPluginFamily          4.7.0a1
com.apple.iokit.IONDRVSupport          2.2.1
com.apple.driver.AppleSMC          3.1.0d5
com.apple.iokit.IOGraphicsFamily          2.2.1
com.apple.driver.CSRUSBBluetoothHCIController          2.4.5f3
com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
com.apple.iokit.IOBluetoothFamily          2.4.5f3
com.apple.driver.AppleUSBMergeNub          4.2.4
com.apple.iokit.IOUSBHIDDriver          4.2.0
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.IOATAPIProtocolTransport          2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
com.apple.iokit.IO80211Family          320.1
com.apple.iokit.IOFireWireFamily          4.2.6
com.apple.iokit.IOAHCIFamily          2.0.6
com.apple.iokit.IOUSBUserClient          4.2.4
com.apple.iokit.IOATAFamily          2.5.1
com.apple.iokit.IONetworkingFamily          1.10
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
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
Any help would be very much appreciated. Thanks, all!

Answer 1

Ignore me. I was looking on the wrong line.
In that case don't use safe mode. Instead uninstall the Symantec software using their universal uninstaller. If the panics continue then try uninstalling the Cisco software.
Uninstalling Software: The Basics
Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash.  Applications may create preference files that are stored in the /Home/Library/Preferences/ folder.  Although they do nothing once you delete the associated application, they do take up some disk space.  If you want you can look for them in the above location and delete them, too.
Some applications may install an uninstaller program that can be used to remove the application.  In some cases the uninstaller may be part of the application's installer, and is invoked by clicking on a Customize button that will appear during the install process.
Some applications may install components in the /Home/Library/Applications Support/ folder.  You can also check there to see if the application has created a folder.  You can also delete the folder that's in the Applications Support folder.  Again, they don't do anything but take up disk space once the application is trashed.
Some applications may install a startupitem or a Log In item.  Startupitems are usually installed in the /Library/StartupItems/ folder and less often in the /Home/Library/StartupItems/ folder.  Log In Items are set in the Accounts preferences.  Open System Preferences, click on the Accounts icon, then click on the LogIn Items tab.  Locate the item in the list for the application you want to remove and click on the "-" button to delete it from the list.
Some software use startup daemons or agents that are a new feature of the OS.  Look for them in /Library/LaunchAgents/ and /Library/LaunchDaemons/ or in /Home/Library/LaunchAgents/.
If an application installs any other files the best way to track them down is to do a Finder search using the application name or the developer name as the search term.  Unfortunately Spotlight will not look in certain folders by default.  You can modify Spotlight's behavior or use a third-party search utility, EasyFind, instead.
Some applications install a receipt in the /Library/Receipts/ folder.  Usually with the same name as the program or the developer.  The item generally has a ".pkg" extension.  Be sure you also delete this item as some programs use it to determine if it's already installed.
There are many utilities that can uninstall applications.  Here is a selection:
    1. AppZapper 2.0.1
    2. AppDelete 3.2.6
    3. Automaton 1.50
    4. Hazel
    5. AppCleaner 2.1.0
    6. CleanApp
    7. iTrash 1.8.2
    8. Amnesia
    9. Uninstaller 1.15.1
  10. Spring Cleaning 11.0.1
For more information visit The XLab FAQs and read the FAQ on removing software.