I "need" to restart my computer often?

Hi all.
I've been having this error coming up frequently for the past time, where I am forced to restart my computer and loose all unsaved data.
I have no idea why this happens. This is where you come in!
Also, I am a blackbook owner.
My error rapport looks like this:

Code:

Interval Since Last Panic Report:  -2 sec
Panics Since Last Report:          1
Anonymous UUID:                    AE4EC6F7-25EC-44EA-83C4-F59C5EE16955

Sun Aug 21 23:47:09 2011
panic(cpu 0 caller 0x001AB0FE): Kernel trap at 0x0068e367, type 14=page fault, registers:
CR0: 0x8001003b, CR2: 0x0000003c, CR3: 0x011f1000, CR4: 0x00000660
EAX: 0x00000000, EBX: 0x00000000, ECX: 0x00000000, EDX: 0x00000000
CR2: 0x0000003c, EBP: 0x2e7376e8, ESI: 0x00000039, EDI: 0x3029d124
EFL: 0x00010202, EIP: 0x0068e367, CS:  0x00000008, DS:  0x04070010
Error code: 0x00000000

Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x2e7374d8 : 0x12b4c6 (0x45f91c 0x2e73750c 0x13355c 0x0) 
0x2e737528 : 0x1ab0fe (0x469a98 0x68e367 0xe 0x469248) 
0x2e737608 : 0x1a1713 (0x2e737620 0x2e7376a8 0x2e7376e8 0x68e367) 
0x2e737618 : 0x68e367 (0xe 0x4070048 0x2e730010 0x620010) 
0x2e7376e8 : 0x688a4c (0x0 0x2e73796c 0x0 0x0) 
0x2e737998 : 0x68917f (0x2e737a84 0x3ea 0x1 0x3a9d33) 
0x2e7379d8 : 0x3c02f9 (0x3f269a0 0x6b767f8 0x0 0x2e737a84) 
0x2e737a28 : 0x3afaa8 (0x6b767f8 0x0 0x2e737a84 0x0) 
0x2e737a78 : 0x2499c0 (0x6b7683c 0x3029cf00 0x1 0xa01a8c0) 
0x2e737c78 : 0x23ee2e (0x3029cf00 0x14 0x14 0x6) 
0x2e737cb8 : 0x240ba9 (0x3029cf00 0x14 0x6 0x0) 
0x2e737dd8 : 0x240be5 (0x3029cf00 0x0 0x2e737e48 0x136cbf) 
0x2e737df8 : 0x22ca34 (0x2 0x3029cf00 0x54769c 0x0) 
0x2e737e38 : 0x21aed6 (0x2 0x3029cf00 0x2e737e88 0x136ed2) 
0x2e737ec8 : 0x217591 (0x47e9c04 0x2 0x3029cf00 0x3ef2c2) 
0x2e737ef8 : 0x217cea (0x530d64 0x446ef48 0x2 0x2e737f74) 
	Backtrace continues...
      Kernel loadable modules in backtrace (with dependencies):
         com.symantec.kext.ips(1.2f28)@0x685000->0x6a3fff
            dependency: com.symantec.kext.internetSecurity(1.1f10)@0x67c000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
9L30

Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
System model name: MacBook4,1 (Mac-F22788A9)

System uptime in nanoseconds: 1295840944668
unloaded kexts:
com.apple.driver.InternalModemSupport	2.4.0 - last unloaded 204447718896
loaded kexts:
foo.tun	1.0 - last loaded 53154613371
foo.tap	1.0
com.parallels.kext.Pvsvnic	3.0
com.parallels.kext.vmmain	3.0
com.parallels.kext.hypervisor	3.0
com.symantec.kext.SymAPComm	11.0.0
com.paceap.kext.pacesupport.leopard	5.6.1
com.parallels.kext.Pvsnet	3.0
com.digidesign.iokit.DigiIO	7.3f117
com.digidesign.iokit.DigiDal	7.3f117
com.orderedbytes.driver.ControllerMateFamily	4.4.3
com.parallels.kext.ConnectUSB	3.0.0
com.orderedbytes.driver.CMUSBDevices	4.4.3
com.symantec.kext.ips	1.2f28
com.symantec.kext.internetSecurity	1.1f10
com.apple.driver.IOBluetoothBNEPDriver	2.1.9f10
com.apple.driver.InternalModemSupport	2.4.0
com.apple.filesystems.autofs	2.0.2
com.apple.driver.AppleHDAPlatformDriver	1.7.1a2
com.apple.iokit.IOBluetoothSerialManager	2.1.9f10
com.apple.driver.AppleHWSensor	1.9d0
com.apple.driver.AppleHDAHardwareConfigDriver	1.7.1a2
com.apple.driver.AppleHDA	1.7.1a2
com.apple.driver.AppleUpstreamUserClient	2.7.5
com.apple.Dont_Steal_Mac_OS_X	6.0.3
com.apple.driver.AppleIRController	113
com.apple.driver.AppleGraphicsControl	2.8.15
com.apple.driver.AppleIntelGMAX3100	5.4.8
com.apple.driver.AppleIntelGMAX3100FB	5.4.8
com.apple.driver.AppleHDAController	1.7.1a2
com.apple.driver.SMCMotionSensor	2.1.1d2
com.apple.iokit.IOFireWireIP	1.7.7
com.apple.driver.AudioIPCDriver	1.0.6
com.apple.driver.ACPI_SMC_PlatformPlugin	3.4.0a17
com.apple.driver.AppleLPC	1.3.1
com.apple.driver.AppleBacklight	1.6.0
com.apple.driver.AppleTyMCEDriver	1.0.0d28
com.apple.driver.CSRUSBBluetoothHCIController	2.1.9f10
com.apple.driver.AppleUSBMergeNub	3.5.2
com.apple.driver.AppleUSBTrackpad	1.7.4f1
com.apple.driver.AppleUSBTCKeyEventDriver	1.7.4f1
com.apple.driver.AppleUSBTCKeyboard	1.7.4f1
com.apple.driver.CSRHIDTransitionDriver	2.1.9f10
com.apple.driver.USBCameraFirmwareLoader	1.0.9
com.apple.iokit.IOSCSIMultimediaCommandsDevice	2.1.1
com.apple.iokit.SCSITaskUserClient	2.1.1
com.apple.driver.XsanFilter	2.7.91
com.apple.iokit.IOATAPIProtocolTransport	1.5.3
com.apple.iokit.IOAHCIBlockStorage	1.2.2
com.apple.driver.AppleAHCIPort	1.7.0
com.apple.driver.AppleIntelPIIXATA	2.0.1
com.apple.driver.AppleFWOHCI	3.9.7
com.apple.driver.AppleUSBHub	3.4.9
com.apple.iokit.IOUSBUserClient	3.5.2
com.apple.driver.AppleUSBEHCI	3.4.6
com.apple.driver.AirPortBrcm43xx	367.91.22
com.apple.driver.AppleFileSystemDriver	1.1.0
com.apple.driver.AppleUSBUHCI	3.5.2
com.apple.iokit.AppleYukon2	3.1.13b2
com.apple.driver.AppleEFINVRAM	1.2.0
com.apple.driver.AppleSmartBatteryManager	158.10.5
com.apple.driver.AppleRTC	1.2.3
com.apple.driver.AppleHPET	1.4
com.apple.driver.AppleACPIPCI	1.2.5
com.apple.driver.AppleACPIButtons	1.2.5
com.apple.driver.AppleSMBIOS	1.4
com.apple.driver.AppleACPIEC	1.2.5
com.apple.driver.AppleAPIC	1.4
com.apple.security.seatbelt	107.12
com.apple.nke.applicationfirewall	1.8.77
com.apple.security.TMSafetyNet	3
com.apple.driver.AppleIntelCPUPowerManagement	76.2.0
com.apple.driver.DiskImages	199
com.apple.BootCache	30.4
com.apple.iokit.IOSerialFamily	9.4
com.apple.driver.DspFuncLib	1.7.1a2
com.apple.iokit.IOHDAFamily	1.7.1a2
com.apple.iokit.IOAudioFamily	1.6.9fc5
com.apple.kext.OSvKernDSPLib	1.1
com.apple.driver.IOPlatformPluginFamily	3.4.0a17
com.apple.driver.AppleSMC	2.3.1d1
com.apple.iokit.IONDRVSupport	1.7.3
com.apple.iokit.IOGraphicsFamily	1.7.3
com.apple.driver.AppleUSBBluetoothHCIController	2.1.9f10
com.apple.iokit.IOBluetoothFamily	2.1.9f10
com.apple.iokit.IOUSBHIDDriver	3.4.6
com.apple.driver.AppleUSBComposite	3.2.0
com.apple.iokit.IOSCSIBlockCommandsDevice	2.1.1
com.apple.iokit.IOBDStorageFamily	1.5
com.apple.iokit.IODVDStorageFamily	1.5
com.apple.iokit.IOCDStorageFamily	1.5
com.apple.iokit.IOSCSIArchitectureModelFamily	2.1.1
com.apple.iokit.IOAHCIFamily	1.5.0
com.apple.iokit.IOATAFamily	2.0.1
com.apple.iokit.IOFireWireFamily	3.4.9
com.apple.iokit.IO80211Family	216.1
com.apple.iokit.IOUSBFamily	3.5.2
com.apple.iokit.IONetworkingFamily	1.6.1
com.apple.driver.AppleEFIRuntime	1.2.0
com.apple.iokit.IOSMBusFamily	1.1
com.apple.iokit.IOStorageFamily	1.5.6
com.apple.iokit.IOHIDFamily	1.5.5
com.apple.driver.AppleACPIPlatform	1.2.5
com.apple.iokit.IOACPIFamily	1.2.0
com.apple.iokit.IOPCIFamily	2.6

Anything odd I can do anything about to save me from this tedious problem?
thanks in advance