Kernal Panics

Hello, recently on my Powerbook G4 I've been getting gkernal panic sand the message " You Need to Restart Your Computer...." I did the Apple Hardware test and everything was fine, so I think it is a software problem. I really don't want to reinstall mac os x, so is there anything else I can do? Here's a copy of the message report in case anybody knows how to read them:
Thank you!!

Interval Since Last Panic Report: 2201 sec
Panics Since Last Report: 1
Anonymous UUID: 8FF96C40-AA94-4FFB-84D5-3D21CAEF2723

Mon Jan 9 19:20:27 2012
panic(cpu 0 caller 0x000B0504): "Uncorrectable machine check: pc = 000000000101D918, msr = 0000000000149030, dsisr = 42000000, dar = 0000000004138000\n" " AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000\n" " L2FIR = 0000000000000000, BusFir = 0000000080000000\n"@/SourceCache/xnu/xnu-1228.15.4/osfmk/ppc/trap.c:975
Latest stack backtrace for cpu 0:
Backtrace:
0x0009CC88 0x0009D63C 0x00029DA0 0x000B0504 0x000B0784 0x000B4278
Proceeding back via exception chain:
Exception state (sv=0x400d9c80)
PC=0x0101D918; MSR=0x00149030; DAR=0x04138000; DSISR=0x42000000; LR=0x0101DA00; R1=0x2AAA3BA0; XCP=0x00000008 (0x200 - Machine check)
Backtrace:
0x03813F90 0x010765E0 0x01076F4C 0x01016EC4 0x0035CED0 0x0035C134
0x0035C1E8 0x000B1DD4
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AirPortBrcm43xx(367.91.22)@0x100d000->0x1139fff
dependency: com.apple.iokit.IO80211Family(216.1)@0xfe9000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x7b2000
dependency: com.apple.iokit.IONetworkingFamily(1.6.1)@0xf6e000
Exception state (sv=0x1e9e6280)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

BSD process name corresponding to current thread: kernel_task

Mac OS version:
9L31a

Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:57:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_PPC
System model name: PowerBook6,8

System uptime in nanoseconds: 2800808046789
unloaded kexts:
com.apple.driver.Apple02DBDMAAudio 2.5.8f1 - last unloaded 2920864157
loaded kexts:
com.symantec.kext.fw 1.0.3f5 - last loaded 1273982427
com.symantec.kext.confidentialData 1.4f5
com.symantec.kext.filesecurity 1.4.3f19
com.symantec.kext.SymAPComm 11.2.2f3
com.symantec.kext.pf 4.2.1f7
com.symantec.kext.ips 3.2f8
com.symantec.kext.internetSecurity 1.3.2f5
com.apple.filesystems.autofs 2.0.2
com.apple.driver.AppleTAS3004Audio 2.5.8f1
com.apple.iokit.IOBluetoothSerialManager 2.1.9f10
com.apple.driver.AudioIPCDriver 1.0.6
com.apple.GeForcePPC 5.4.8
com.apple.driver.InternalModemSupport 2.4.0
com.apple.driver.MotorolaSM56K 1.3.9
com.apple.driver.Portable_PlatformMonitor 1.8.7d5
com.apple.iokit.IOFireWireIP 1.7.7
com.apple.driver.AppleVSP 2.2.2
com.apple.driver.AppleThermal 1.0.1f2
com.apple.driver.AppleSCCSerial 1.3.2
com.apple.driver.AppleHWSensor 1.9d0
com.apple.driver.AppleHWClock 1.5.2d0
com.apple.driver.AppleADBButtons 3.0
com.apple.driver.AppleTexasAudio 2.5.8f1
com.apple.driver.AppleTexas2Audio 2.5.8f1
com.apple.driver.AppleDACAAudio 2.5.8f1
com.apple.driver.AppleK2Driver 1.7.2f1