early 2009 MacBook Pro crashes Yosemite

Hey, my macbook started to act weird and it crashes from time to time and reboots its self: here's the report of the problem
Anonymous UUID: 3056B28E-FAA2-9967-2230-1FB1E98840E8

Wed Oct 29 22:21:55 2014

*** Panic Report ***
panic(cpu 1 caller 0xffffff801e21e80a): Kernel trap at 0xffffff801e65bc5a, type 13=general protection, registers:
CR0: 0x000000008001003b, CR2: 0x000000010e1a6094, CR3: 0x0000000021269000, CR4: 0x0000000000002660
RAX: 0xffff4a7fa004dd80, RBX: 0xffffff7fa00508f0, RCX: 0xffffff802f8ed380, RDX: 0x00000027833057d1
RSP: 0xffffff811f0fbe40, RBP: 0xffffff811f0fbe50, RSI: 0xffffff7fa00508f0, RDI: 0xffffff80307efe00
R8: 0x0000000000000000, R9: 0x0000000000000000, R10: 0x0000000000000000, R11: 0x0000002780353c13
R12: 0xffffff7fa00508f0, R13: 0xffffff802fed5000, R14: 0xffffff80307efe00, R15: 0xffffff8039923e40
RFL: 0x0000000000010286, RIP: 0xffffff801e65bc5a, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x000000010e1a6094, Error code: 0x0000000000000000, Fault CPU: 0x1

Backtrace (CPU 1), Frame : Return Address
0xffffff80f8f05e10 : 0xffffff801e13a811
0xffffff80f8f05e90 : 0xffffff801e21e80a
0xffffff80f8f06050 : 0xffffff801e23a443
0xffffff80f8f06070 : 0xffffff801e65bc5a
0xffffff811f0fbe50 : 0xffffff7fa00462f2
0xffffff811f0fbeb0 : 0xffffff7f9f555a6d
0xffffff811f0fbee0 : 0xffffff7f9f55345e
0xffffff811f0fbf00 : 0xffffff801e16be13
0xffffff811f0fbfb0 : 0xffffff801e2192c7
Kernel Extensions in backtrace:
com.apple.iokit.IOUSBHIDDriver(705.4)[2CB055E6-0535-39A2-A393-F8FECDA6863B]@0xffffff7f9f552000->0xffffff7f9f55afff
dependency: com.apple.iokit.IOHIDFamily(2.0.0)[917971EF-5947-3DF5-BB9F-D353D05C0484]@0xffffff7f9f4bf000
dependency: com.apple.iokit.IOUSBFamily(705.4.14)[E15E9DC8-410F-3612-8371-E5FECD939E0D]@0xffffff7f9f42c000
com.apple.driver.AppleUSBMultitouch(245.2)[BB8FCA87-2E8C-36C5-8221-32343DB479F9]@0xffffff7fa0042000->0xffffff7fa0054fff
dependency: com.apple.iokit.IOUSBFamily(705.4.14)[E15E9DC8-410F-3612-8371-E5FECD939E0D]@0xffffff7f9f42c000
dependency: com.apple.iokit.IOHIDFamily(2.0.0)[917971EF-5947-3DF5-BB9F-D353D05C0484]@0xffffff7f9f4bf000
dependency: com.apple.iokit.IOUSBHIDDriver(705.4.0)[2CB055E6-0535-39A2-A393-F8FECDA6863B]@0xffffff7f9f552000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
14A389

Kernel version:
Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64
Kernel UUID: 89E10306-BC78-3A3B-955C-7C4922577E61
Kernel slide: 0x000000001de00000
Kernel text base: 0xffffff801e000000
__HIB text base: 0xffffff801df00000
System model name: MacBookPro5,2 (Mac-F2268EC8)

System uptime in nanoseconds: 169654820545
last loaded kext at 85800328402: com.avast.AvastFileShield 2.1.0 (addr 0xffffff7fa075e000, size 40960)
loaded kexts:
com.avast.AvastFileShield 2.1.0
com.avast.PacketForwarder 1.4
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AppleTyMCEDriver 1.0.2d2
com.apple.driver.AGPM 100.14.37
com.apple.filesystems.autofs 3.0
com.apple.iokit.IOBluetoothSerialManager 4.3.0f10
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleHDAHardwareConfigDriver 266.5
com.apple.driver.AppleHDA 266.5
com.apple.driver.AppleMikeyDriver 266.5
com.apple.driver.AppleSMCLMU 2.0.4d1
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleHV 1
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.GeForceTesla 10.0.0
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.iokit.IOBluetoothUSBDFU 4.3.0f10
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.0f10
com.apple.driver.AppleLPC 1.7.3
com.apple.driver.AppleMuxControl 3.7.21
com.apple.driver.AppleBacklight 170.4.12
com.apple.driver.AppleMCCSControl 1.2.10
com.apple.nvidia.NVDAStartup 10.0.0
com.apple.driver.SMCMotionSensor 3.0.4d1
com.apple.driver.AppleUSBTCButtons 240.2
com.apple.driver.AppleFileSystemDriver 3.0.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.driver.AppleUSBTCKeyEventDriver 240.2
com.apple.driver.AppleUSBTCKeyboard 240.2
com.apple.driver.AppleIRController 327.5
com.apple.iokit.SCSITaskUserClient 3.7.0
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.6.5
com.apple.driver.AppleUSBOHCI 656.4.1
com.apple.driver.AppleAHCIPort 3.0.7
com.apple.driver.AppleFWOHCI 5.5.2
com.apple.driver.AirPort.Brcm4331 800.20.24
com.apple.driver.AppleUSBHub 705.4.1
com.apple.nvenet 2.0.22
com.apple.driver.AppleUSBEHCI 705.4.14
com.apple.driver.AppleSmartBatteryManager 161.0.0
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleACPIButtons 3.1
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 3.1
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0
com.apple.nke.applicationfirewall 161
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.AppleIntelCPUPowerManagement 218.0.0
com.apple.AppleGraphicsDeviceControl 3.7.21
com.apple.kext.triggers 1.0
com.apple.iokit.IOSerialFamily 11
com.apple.driver.DspFuncLib 266.5
com.apple.kext.OSvKernDSPLib 1.15
com.apple.iokit.IOAudioFamily 200.6
com.apple.vecLib.kext 1.2.0
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.iokit.IOSurface 97
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.nvidia.classic.NVDANV50HalTesla 10.0.0
com.apple.nvidia.classic.NVDAResmanTesla 10.0.0
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.0f10
com.apple.iokit.IOBluetoothFamily 4.3.0f10
com.apple.iokit.IOUSBUserClient 705.4.0
com.apple.driver.AppleHDAController 266.5
com.apple.iokit.IOHDAFamily 266.5
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.driver.IOPlatformPluginFamily 5.8.0d49
com.apple.driver.AppleGraphicsControl 3.7.21
com.apple.driver.AppleBacklightExpert 1.1.0
com.apple.driver.AppleSMBusController 1.0.13d1
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.driver.AppleSMC 3.1.9
com.apple.driver.AppleUSBMultitouch 245.2
com.apple.iokit.IOUSBHIDDriver 705.4.0
com.apple.driver.AppleUSBMergeNub 705.4.0
com.apple.driver.AppleUSBComposite 705.4.9
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.0
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOAHCISerialATAPI 2.6.1
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.0
com.apple.iokit.IOAHCIFamily 2.7.0
com.apple.iokit.IOFireWireFamily 4.5.6
com.apple.iokit.IO80211Family 700.52
com.apple.iokit.IONetworkingFamily 3.2
com.apple.driver.NVSMU 2.2.9
com.apple.iokit.IOUSBFamily 705.4.14
com.apple.driver.AppleEFINVRAM 2.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 300.0
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.AppleKeyStore 2
com.apple.driver.AppleMobileFileIntegrity 1.0.5
com.apple.driver.AppleCredentialManager 1.0
com.apple.driver.DiskImages 389.1
com.apple.iokit.IOStorageFamily 2.0
com.apple.iokit.IOReportFamily 31
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 3.1
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.Libm 1
com.apple.kec.pthread 1
com.apple.kec.corecrypto 1.0