Intermittent kernel panic

I have been getting intermittent kernel panics since I have purchased my refurbished MacBook Pro. I can reproduce it consistently, all I can say that it happens once in a while regardless of what applications are open (e.g. surfing the web with Firefox or Safari or doing nothing). How can I decipher the kernel panic log to find out what is causing it?

Here is the kernel panic log:

Mon Mar 8 16:06:10 2010
panic(cpu 1 caller 0x2a6ac2): Kernel trap at 0x00296416, type 14=page fault, registers:
CR0: 0x8001003b, CR2: 0x00000008, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x00000000, EBX: 0x08445990, ECX: 0x081c59b8, EDX: 0x00000000
CR2: 0x00000008, EBP: 0x5878be48, ESI: 0x004abf70, EDI: 0x09070bd8
EFL: 0x00010206, EIP: 0x00296416, CS: 0x00000008, DS: 0x08990010
Error code: 0x00000000

Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x5878bc68 : 0x21acfa (0x5ce650 0x5878bc9c 0x223156 0x0)
0x5878bcb8 : 0x2a6ac2 (0x590a50 0x296416 0xe 0x590c1a)
0x5878bd98 : 0x29c968 (0x5878bdb0 0x95173d4 0x5878be48 0x296416)
0x5878bda8 : 0x296416 (0xe 0x48 0x58780010 0x210010)
0x5878be48 : 0x4b78c7 (0x0 0xe17 0x95173d4 0x1e8480)
0x5878be78 : 0x4ab328 (0x8445990 0x1 0x4abf70 0xe17)
0x5878be98 : 0x4abf70 (0x8445990 0x1 0x5878bed8 0x23117d)
0x5878bed8 : 0x46fbeb (0x9070bd8 0x0 0x5878bf18 0x22a431)
0x5878bf78 : 0x4706ec (0x5878bfac 0x8965a80 0x0 0x5003)
0x5878bfc8 : 0x29c68c (0x81c5980 0x0 0x10 0x93e3f84)

BSD process name corresponding to current thread: mDNSResponder

Mac OS version:
10A432

Kernel version:
Darwin Kernel Version 10.0.0: Fri Jul 31 22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_I386
System model name: MacBookPro5,4 (Mac-F22587A1)

System uptime in nanoseconds: 15494295646309
unloaded kexts:
com.apple.driver.AppleFileSystemDriver 2.0 (addr 0xfd9000, size 0x12288) - last unloaded 108787877068
loaded kexts:
com.apple.driver.AppleHWSensor 1.9.2d0 - last loaded 17699764339
com.apple.filesystems.autofs 2.1.0
com.apple.driver.AGPM 100.8.15
com.apple.driver.AppleMikeyHIDDriver 1.1.7
com.apple.driver.AppleUpstreamUserClient 3.0.5
com.apple.driver.AppleHDA 1.7.4a1
com.apple.driver.AppleMikeyDriver 1.7.4a1
com.apple.driver.SMCMotionSensor 3.0.0d4
com.apple.driver.NVSMU 1.1.7
com.apple.driver.AppleIRController 161
com.apple.kext.AppleSMCLMU 1.4.5d1
com.apple.Dont Steal_Mac_OSX 7.0.0
com.apple.driver.AudioIPCDriver 1.1.0
com.apple.driver.AppleIntelPenrynProfile 17
com.apple.driver.ACPI SMCPlatformPlugin 3.4.0a20
com.apple.driver.AppleBacklight 170.0.2
com.apple.driver.AppleLPC 1.4.6
com.apple.GeForce 6.0.0
com.apple.driver.AppleUSBTCButtons 1.8.0b4
com.apple.driver.AppleUSBTCKeyboard 1.8.0b4
com.apple.driver.AppleUSBCardReader 2.5.0
com.apple.iokit.SCSITaskUserClient 2.5.0
com.apple.BootCache 31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.iokit.IOAHCIBlockStorage 1.5.0
com.apple.driver.AppleSmartBatteryManager 160.0.0
com.apple.driver.AirPortBrcm43xx 410.91.20
com.apple.driver.AppleAHCIPort 2.0.0
com.apple.nvenet 1.0.58
com.apple.driver.AppleFWOHCI 4.3.4
com.apple.driver.AppleUSBHub 3.7.8
com.apple.driver.AppleUSBEHCI 3.7.5
com.apple.driver.AppleUSBOHCI 3.7.5
com.apple.driver.AppleEFINVRAM 1.3.0
com.apple.driver.AppleRTC 1.3
com.apple.driver.AppleHPET 1.4
com.apple.driver.AppleACPIButtons 1.3
com.apple.driver.AppleSMBIOS 1.4
com.apple.driver.AppleACPIEC 1.3
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 90.0.0
com.apple.security.sandbox 0
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.0.11
com.apple.driver.AppleIntelCPUPowerManagement 90.0.0
com.apple.iokit.IOBluetoothSerialManager 2.2f18
com.apple.iokit.IOSerialFamily 10.0.2
com.apple.driver.DspFuncLib 1.7.4a1
com.apple.driver.AppleProfileReadCounterAction 17
com.apple.driver.AppleSMBusController 1.0.2d0
com.apple.nvidia.nv50hal 6.0.0
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.iokit.IOFireWireIP 2.0.3
com.apple.iokit.IOSurface 73.0
com.apple.iokit.IOAudioFamily 1.7.0fc16
com.apple.kext.OSvKernDSPLib 1.3
com.apple.driver.AppleHDAController 1.7.4a1
com.apple.iokit.IOHDAFamily 1.7.4a1
com.apple.iokit.AppleProfileFamily 40
com.apple.driver.AppleSMC 3.0.1d2
com.apple.driver.IOPlatformPluginFamily 3.4.0a20
com.apple.driver.AppleSMBusPCI 1.0.2d0
com.apple.NVDAResman 6.0.0
com.apple.iokit.IONDRVSupport 2.0
com.apple.iokit.IOGraphicsFamily 2.0
com.apple.driver.BroadcomUSBBluetoothHCIController 2.2f18
com.apple.driver.AppleUSBBluetoothHCIController 2.2f18
com.apple.iokit.IOBluetoothFamily 2.2f18
com.apple.driver.AppleUSBMultitouch 200.20
com.apple.iokit.IOUSBHIDDriver 3.7.5
com.apple.iokit.IOSCSIBlockCommandsDevice 2.5.0
com.apple.iokit.IOUSBMassStorageClass 2.5.0
com.apple.driver.AppleUSBMergeNub 3.7.5
com.apple.driver.AppleUSBComposite 3.7.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.5.0
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6
com.apple.driver.XsanFilter 402.1
com.apple.iokit.IOAHCISerialATAPI 1.2.0
com.apple.iokit.IOSCSIArchitectureModelFamily 2.5.0
com.apple.iokit.IO80211Family 300.20
com.apple.iokit.IOAHCIFamily 2.0.0
com.apple.iokit.IONetworkingFamily 1.8
com.apple.iokit.IOFireWireFamily 4.1.7
com.apple.iokit.IOUSBUserClient 3.7.5
com.apple.iokit.IOUSBFamily 3.7.8
com.apple.driver.AppleEFIRuntime 1.3.0
com.apple.iokit.IOHIDFamily 1.6.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.kext.AppleMatch 1.0.0d1
com.apple.security.TMSafetyNet 6
com.apple.driver.DiskImages 281
com.apple.iokit.IOStorageFamily 1.6
com.apple.driver.AppleACPIPlatform 1.3
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.3.0