My Macbook is rebooting itself all the time randomly! - Help!

My Macbook is randomally rebooting itself (seems like it's juicing memory like it was a hot day). although I have 3 things opened (firefox, word, powerpoint) it seems like it's too much for it.

It's a Macbook 13"- Aluminum from late 2008

Processor 2 GHz Intel Core 2 Duo

Memory 8 GB 1333 MHz DDR3

Graphics NVIDIA GeForce 9400M 256 MB

Software OS X 10.8.4 (12E55)

Any ideas what's causing it and how can I fix things myself if I can???

Interval Since Last Panic Report: 24423 sec

Panics Since Last Report: 2

Anonymous UUID: 93A2B9DF-15FC-0D51-7799-440BC2AC9810

Wed Aug 28 09:02:16 2013

panic(cpu 1 caller 0xffffff80072b8655): Kernel trap at 0xffffff80072f7c44, type 14=page fault, registers:

CR0: 0x000000008001003b, CR2: 0xffffef801e5544f0, CR3: 0x00000000204f9000, CR4: 0x0000000000000660

RAX: 0xffffff80194a66d8, RBX: 0xffffff801e5ef3e0, RCX: 0xffffef801e5544d8, RDX: 0x0000000000000000

RSP: 0xffffff80e8ca3d40, RBP: 0xffffff80e8ca3d40, RSI: 0x000000001da74105, RDI: 0xffffff801e5ef3e0

R8: 0x0000000000000001, R9: 0x0000000000000000, R10: 0xffffff801f527142, R11: 0x0000000000000004

R12: 0x0000000000000020, R13: 0xffffff801e5ef430, R14: 0xffffff80192c9b88, R15: 0x0000000000000000

RFL: 0x0000000000010286, RIP: 0xffffff80072f7c44, CS: 0x0000000000000008, SS: 0x0000000000000010

Fault CR2: 0xffffef801e5544f0, Error code: 0x0000000000000002, Fault CPU: 0x1

Backtrace (CPU 1), Frame : Return Address

0xffffff80e8ca39e0 : 0xffffff800721d626

0xffffff80e8ca3a50 : 0xffffff80072b8655

0xffffff80e8ca3c20 : 0xffffff80072ce17d

0xffffff80e8ca3c40 : 0xffffff80072f7c44

0xffffff80e8ca3d40 : 0xffffff80072f0560

0xffffff80e8ca3d90 : 0xffffff80072ee3f1

0xffffff80e8ca3e00 : 0xffffff800750616b

0xffffff80e8ca3eb0 : 0xffffff80072fa0af

0xffffff80e8ca3ee0 : 0xffffff80072f37a7

0xffffff80e8ca3f40 : 0xffffff80072fa029

0xffffff80e8ca3f60 : 0xffffff80075e13b3

0xffffff80e8ca3fb0 : 0xffffff80072ce6ad

BSD process name corresponding to current thread: cfbackd

Mac OS version:

12E55

Kernel version:

Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64

Kernel UUID: 896CB1E3-AB79-3DF1-B595-549DFFDF3D36

Kernel slide: 0x0000000007000000

Kernel text base: 0xffffff8007200000

System model name: MacBook5,1 (Mac-F42D89A9)

System uptime in nanoseconds: 20103233121960

last loaded kext at 19955553050471: com.sophos.kext.sav 8.0.14 (addr 0xffffff7f89414000, size 24576)

last unloaded kext at 19939332368396: com.sophos.kext.sav 8.0.14 (addr 0xffffff7f8940f000, size 20480)

loaded kexts:

com.sophos.kext.sav 8.0.14

com.pandasecurity.iokit.FileInterceptor 5.9.1

com.avg.netshield.kext 1.1

com.Cycling74.driver.WondershareAudioDevice 1.5.2

at.obdev.nke.LittleSnitch 3876

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.iokit.IOBluetoothSerialManager 4.1.4f2

com.apple.driver.AGPM 100.12.87

com.apple.driver.AppleHDA 2.3.7fc4

com.apple.driver.AppleMikeyHIDDriver 122

com.apple.driver.AudioAUUC 1.60

com.apple.iokit.IOUserEthernet 1.0.0d1

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.ApplePolicyControl 3.4.5

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.AppleMikeyDriver 2.3.7fc4

com.apple.driver.AppleLPC 1.6.0

com.apple.driver.AppleSMCLMU 2.0.3d0

com.apple.filesystems.autofs 3.0

com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport 4.1.4f2

com.apple.GeForce 8.1.2

com.apple.driver.AppleUpstreamUserClient 3.5.10

com.apple.driver.AppleBacklight 170.2.5

com.apple.driver.AppleMCCSControl 1.1.11

com.apple.driver.SMCMotionSensor 3.0.3d1

com.apple.driver.AppleUSBTCButtons 237.1

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.BootCache 34

com.apple.driver.AppleUSBTCKeyboard 237.1

com.apple.driver.AppleIRController 320.15

com.apple.iokit.SCSITaskUserClient 3.5.5

com.apple.driver.XsanFilter 404

com.apple.iokit.IOAHCIBlockStorage 2.3.1

com.apple.driver.AirPort.Brcm4331 615.20.17

com.apple.driver.AppleAHCIPort 2.5.2

com.apple.nvenet 2.0.19

com.apple.driver.AppleUSBOHCI 5.2.5

com.apple.driver.AppleUSBHub 5.5.5

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleUSBEHCI 5.5.0

com.apple.driver.AppleEFINVRAM 1.7

com.apple.driver.AppleRTC 1.5

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleACPIButtons 1.7

com.apple.driver.AppleSMBIOS 1.9

com.apple.driver.AppleACPIEC 1.7

com.apple.driver.AppleAPIC 1.6

com.apple.driver.AppleIntelCPUPowerManagementClient 196.0.0

com.apple.nke.applicationfirewall 4.0.39

com.apple.security.quarantine 2.1

com.apple.driver.AppleIntelCPUPowerManagement 196.0.0

com.apple.iokit.IOSerialFamily 10.0.6

com.apple.driver.DspFuncLib 2.3.7fc4

com.apple.iokit.IOAudioFamily 1.8.9fc11

com.apple.kext.OSvKernDSPLib 1.6

com.apple.iokit.IOSurface 86.0.4

com.apple.iokit.IOBluetoothFamily 4.1.4f2

com.apple.driver.AppleHDAController 2.3.7fc4

com.apple.iokit.IOHDAFamily 2.3.7fc4

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.AppleSMBusPCI 1.0.11d0

com.apple.driver.IOPlatformPluginFamily 5.3.0d51

com.apple.kext.triggers 1.0

com.apple.iokit.AppleBluetoothHCIControllerUSBTransport 4.1.4f2

com.apple.nvidia.nv50hal 8.1.2

com.apple.NVDAResman 8.1.2

com.apple.driver.AppleGraphicsControl 3.4.5

com.apple.driver.AppleBacklightExpert 1.0.4

com.apple.driver.AppleSMBusController 1.0.11d0

com.apple.iokit.IONDRVSupport 2.3.7

com.apple.iokit.IOGraphicsFamily 2.3.7

com.apple.driver.AppleSMC 3.1.4d2

com.apple.driver.AppleUSBMultitouch 237.3

com.apple.iokit.IOUSBHIDDriver 5.2.5

com.apple.driver.AppleUSBMergeNub 5.5.5

com.apple.driver.AppleUSBComposite 5.2.5

com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.5.5

com.apple.iokit.IOBDStorageFamily 1.7

com.apple.iokit.IODVDStorageFamily 1.7.1

com.apple.iokit.IOCDStorageFamily 1.7.1

com.apple.iokit.IOAHCISerialATAPI 2.5.1

com.apple.iokit.IOSCSIArchitectureModelFamily 3.5.5

com.apple.iokit.IO80211Family 530.4

com.apple.iokit.IOAHCIFamily 2.3.1

com.apple.iokit.IONetworkingFamily 3.0

com.apple.iokit.IOUSBUserClient 5.5.5

com.apple.iokit.IOUSBFamily 5.6.0

com.apple.driver.NVSMU 2.2.9

com.apple.driver.AppleEFIRuntime 1.7

com.apple.iokit.IOHIDFamily 1.8.1

com.apple.iokit.IOSMBusFamily 1.1

com.apple.security.sandbox 220.3

com.apple.kext.AppleMatch 1.0.0d1

com.apple.security.TMSafetyNet 7

com.apple.driver.DiskImages 345

com.apple.iokit.IOStorageFamily 1.8

com.apple.driver.AppleKeyStore 28.21

com.apple.driver.AppleACPIPlatform 1.7

com.apple.iokit.IOPCIFamily 2.7.3

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.corecrypto 1.0

Model: MacBook5,1, BootROM MB51.007D.B03, 2 processors, Intel Core 2 Duo, 2 GHz, 8 GB, SMC 1.40f2

Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0000, 0x000000000000000000000000000000000000

Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x0000, 0x000000000000000000000000000000000000

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.106.98.100.17)

Bluetooth: Version 4.1.4f2 12041, 2 service, 18 devices, 1 incoming serial ports

Network Service: Ethernet, Ethernet, en0

Network Service: AirPort, AirPort, en1

Serial ATA Device: Hitachi HTS545032B9A300, 320.07 GB

Serial ATA Device: OPTIARC DVD RW AD-5960S

USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0x24400000 / 2

USB Device: USB Receiver, 0x046d (Logitech Inc.), 0xc521, 0x06200000 / 3

USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000 / 2

USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8213, 0x06110000 / 4

USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0x04600000 / 3

USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2