My MBP late 2011 Mountain Lion keeps crashing and reporting serious errors

This is the last diagnostic report when I booted into my MBP today. Can anyone give me some insight into this, please? Never had problems till I upgraded to Mountain Lion. Kind regards.

Interval Since Last Panic Report: 72899 sec

Panics Since Last Report: 1

Anonymous UUID: FFCFE92B-1207-C864-465F-32B452CDC7DB

Mon Sep 24 14:25:57 2012

panic(cpu 3 caller 0xffffff80262b7bd5): Kernel trap at 0xffffff80262460b4, type 13=general protection, registers:

CR0: 0x0000000080010033, CR2: 0x00007fff5a0d8ff8, CR3: 0x000000001901c003, CR4: 0x00000000000606e0

RAX: 0xdeadbeefdeadbeef, RBX: 0xffffff7fa7e7c148, RCX: 0xffffff8036bebdf0, RDX: 0x0000000000000000

RSP: 0xffffff802d7c2940, RBP: 0xffffff802d7c2940, RSI: 0xffffff7fa7e7c360, RDI: 0xffffff80316aaaa0

R8: 0xffffff803375b268, R9: 0x0000000000000000, R10: 0xffffff8036bebdf0, R11: 0x0000000000000246

R12: 0x0000000000000001, R13: 0xffffff803375b268, R14: 0xffffff803375b268, R15: 0xffffff8036bebdf0

RFL: 0x0000000000010282, RIP: 0xffffff80262460b4, CS: 0x0000000000000008, SS: 0x0000000000000010

Fault CR2: 0x00007fff5a0d8ff8, Error code: 0x0000000000000000, Fault CPU: 0x3

Backtrace (CPU 3), Frame : Return Address

0xffffff802d7c25e0 : 0xffffff802621d626

0xffffff802d7c2650 : 0xffffff80262b7bd5

0xffffff802d7c2820 : 0xffffff80262ce4ed

0xffffff802d7c2840 : 0xffffff80262460b4

0xffffff802d7c2940 : 0xffffff802630f9e6

0xffffff802d7c2950 : 0xffffff7fa7e7b021

0xffffff802d7c29b0 : 0xffffff7fa7e7a47b

0xffffff802d7c3a30 : 0xffffff8026540db1

0xffffff802d7c3a90 : 0xffffff80262f56a6

0xffffff802d7c3ae0 : 0xffffff8026309351

0xffffff802d7c3b90 : 0xffffff80262fbb49

0xffffff802d7c3c40 : 0xffffff80262fc314

0xffffff802d7c3f50 : 0xffffff80265e182a

0xffffff802d7c3fb0 : 0xffffff80262ced33

Kernel Extensions in backtrace:

com.avast.AvastFileShield(1.0.1)[A0A1FD97-2C58-7950-37D9-0CD538FAD375]@0xffffff 7fa7e79000->0xffffff7fa7e7efff

BSD process name corresponding to current thread: Install in Progr

Mac OS version:

12C54

Kernel version:

Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64

Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333

Kernel slide: 0x0000000026000000

Kernel text base: 0xffffff8026200000

System model name: MacBookPro8,1 (Mac-94245B3640C91C81)

System uptime in nanoseconds: 14791902794991

last loaded kext at 2408653166296: com.trusteer.driver.gakl_driver_2 1 (addr 0xffffff7fa7eb5000, size 28672)

last unloaded kext at 190541289680: com.apple.driver.AppleUSBUHCI 5.2.5 (addr 0xffffff7fa6bf2000, size 65536)

loaded kexts:

com.trusteer.driver.gakl_driver_2 1

com.avast.PacketForwarder 1.3

com.avast.AvastFileShield 1.0.1

com.rim.driver.BlackBerryUSBDriverInt 0.0.74

com.apple.filesystems.smbfs 1.8

com.apple.filesystems.ntfs 3.10

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.iokit.IOBluetoothSerialManager 4.0.9f33

com.apple.driver.AudioAUUC 1.60

com.apple.driver.AGPM 100.12.69

com.apple.iokit.IOUserEthernet 1.0.0d1

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleMikeyHIDDriver 122

com.apple.driver.AppleHDA 2.3.1f2

com.apple.driver.AppleMikeyDriver 2.3.1f2

com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport 4.0.9f33

com.apple.driver.AppleLPC 1.6.0

com.apple.driver.AppleUpstreamUserClient 3.5.10

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.ApplePolicyControl 3.2.11

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.AppleSMCPDRC 1.0.0

com.apple.driver.AppleBacklight 170.2.3

com.apple.driver.AppleMCCSControl 1.0.33

com.apple.driver.AppleIntelHD3000Graphics 8.0.0

com.apple.driver.AppleIntelSNBGraphicsFB 8.0.0

com.apple.driver.AppleSMCLMU 2.0.2d0

com.apple.driver.SMCMotionSensor 3.0.2d6

com.apple.driver.AppleUSBTCButtons 235.4

com.apple.driver.AppleUSBTCKeyboard 235.4

com.apple.driver.AppleIRController 320.15

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.BootCache 34

com.apple.iokit.SCSITaskUserClient 3.5.1

com.apple.driver.XsanFilter 404

com.apple.iokit.IOAHCIBlockStorage 2.2.2

com.apple.driver.AppleUSBHub 5.2.5

com.apple.iokit.AppleBCM5701Ethernet 3.2.5b3

com.apple.driver.AppleSDXC 1.2.2

com.apple.driver.AppleFWOHCI 4.9.6

com.apple.driver.AppleAHCIPort 2.4.1

com.apple.driver.AirPort.Brcm4331 602.15.22

com.apple.driver.AppleUSBEHCI 5.4.0

com.apple.driver.AppleEFINVRAM 1.6.1

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleACPIButtons 1.6

com.apple.driver.AppleRTC 1.5

com.apple.driver.AppleHPET 1.7

com.apple.driver.AppleSMBIOS 1.9

com.apple.driver.AppleACPIEC 1.6

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

com.apple.driver.AppleIntelCPUPowerManagement 196.0.0

com.apple.iokit.IOSerialFamily 10.0.6

com.apple.iokit.IOSurface 86.0.3

com.apple.iokit.IOBluetoothFamily 4.0.9f33

com.apple.kext.triggers 1.0

com.apple.driver.DspFuncLib 2.3.1f2

com.apple.iokit.IOAudioFamily 1.8.9fc10

com.apple.kext.OSvKernDSPLib 1.6

com.apple.driver.AppleHDAController 2.3.1f2

com.apple.iokit.IOHDAFamily 2.3.1f2

com.apple.iokit.AppleBluetoothHCIControllerUSBTransport 4.0.9f33

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.AppleSMBusPCI 1.0.10d0

com.apple.driver.IOPlatformPluginFamily 5.2.0d16

com.apple.driver.AppleSMBusController 1.0.10d0

com.apple.driver.AppleGraphicsControl 3.2.11

com.apple.driver.AppleBacklightExpert 1.0.4

com.apple.iokit.IONDRVSupport 2.3.5

com.apple.iokit.IOGraphicsFamily 2.3.5

com.apple.iokit.IOFireWireIP 2.2.5

com.apple.driver.AppleSMC 3.1.4d2

com.apple.driver.AppleThunderboltDPInAdapter 1.8.5

com.apple.driver.AppleThunderboltDPAdapterFamily 1.8.5

com.apple.driver.AppleThunderboltPCIDownAdapter 1.2.5

com.apple.driver.AppleUSBMultitouch 235.7

com.apple.iokit.IOUSBHIDDriver 5.2.5

com.apple.driver.AppleUSBMergeNub 5.2.5

com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.5.1

com.apple.iokit.IOBDStorageFamily 1.7

com.apple.iokit.IODVDStorageFamily 1.7.1

com.apple.iokit.IOCDStorageFamily 1.7.1

com.apple.iokit.IOAHCISerialATAPI 2.5.0

com.apple.driver.AppleThunderboltNHI 1.6.0

com.apple.iokit.IOThunderboltFamily 2.1.1

com.apple.iokit.IOEthernetAVBController 1.0.2b1

com.apple.iokit.IOUSBUserClient 5.2.5

com.apple.iokit.IOFireWireFamily 4.5.5

com.apple.iokit.IOAHCIFamily 2.2.1

com.apple.iokit.IO80211Family 500.15

com.apple.iokit.IONetworkingFamily 3.0

com.apple.driver.AppleEFIRuntime 1.6.1

com.apple.iokit.IOHIDFamily 1.8.0

com.apple.iokit.IOSMBusFamily 1.1

com.apple.security.sandbox 220

com.apple.kext.AppleMatch 1.0.0d1

com.apple.security.TMSafetyNet 7

com.apple.driver.DiskImages 344

com.apple.driver.AppleKeyStore 28.21

com.apple.iokit.IOUSBMassStorageClass 3.5.0

com.apple.driver.AppleUSBComposite 5.2.5

com.apple.iokit.IOSCSIBlockCommandsDevice 3.5.1

com.apple.iokit.IOStorageFamily 1.8

com.apple.iokit.IOSCSIArchitectureModelFamily 3.5.1

com.apple.iokit.IOUSBFamily 5.4.0

com.apple.driver.AppleACPIPlatform 1.6

com.apple.iokit.IOPCIFamily 2.7.1

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.corecrypto 1.0

Model: MacBookPro8,1, BootROM MBP81.0047.B27, 2 processors, Intel Core i5, 2.4 GHz, 4 GB, SMC 1.68f98

Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 384 MB

Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020

Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.81.22)

Bluetooth: Version 4.0.9f33 10885, 2 service, 11 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: TOSHIBA MK5065GSXF, 500.11 GB

Serial ATA Device: MATSHITADVD-R UJ-8A8

USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8509, 0xfa200000 / 3

USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfa100000 / 2

USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 5

USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x821a, 0xfa113000 / 8

USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0253, 0xfa120000 / 4

USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfd100000 / 2

USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd110000 / 3