IMac is booting from time to time after update to 10.9.1

looked in log files but didn't help. Here's one crash report
Anonymous UUID:       DDA08AEB-C047-B9CD-C69A-AD90D108A0DC
Mon Feb 24 16:02:34 2014
panic(cpu 0 caller 0xffffff8017edc19e): Kernel trap at 0xffffff8018098f40, type 13=general protection, registers:
CR0: 0x000000008001003b, CR2: 0xffffff8395220000, CR3: 0x000000001ab3b000, CR4: 0x00000000001606e0
RAX: 0x00001ff394865b5e, RBX: 0xf1067843cd3269d0, RCX: 0x0000000000000020, RDX: 0x00001ff394865b5e
RSP: 0xffffff83a74b2ea8, RBP: 0xffffff83a74b2f20, RSI: 0x0000000000000000, RDI: 0xffffffffffffffff
R8:  0x0000000000000004, R9:  0x0000000000000000, R10: 0x0000000090308000, R11: 0xffffffffffffffff
R12: 0xffffff8056cabfa0, R13: 0x00001ff300000000, R14: 0xffffff8056cadea0, R15: 0xffffff8056cabfa0
RFL: 0x0000000000010246, RIP: 0xffffff8018098f40, CS:  0x0000000000000008, SS:  0x0000000000000010
Fault CR2: 0xffffff8395220000, Error code: 0x0000000000000000, Fault CPU: 0x0
Backtrace (CPU 0), Frame : Return Address
0xffffff8395b2fc50 : 0xffffff8017e22f69
0xffffff8395b2fcd0 : 0xffffff8017edc19e
0xffffff8395b2fea0 : 0xffffff8017ef3606
0xffffff8395b2fec0 : 0xffffff8018098f40
0xffffff83a74b2f20 : 0xffffff80180961ce
0xffffff83a74b2f40 : 0xffffff8018029f47
0xffffff83a74b2f60 : 0xffffff801802bb33
0xffffff83a74b3080 : 0xffffff80180cc151
0xffffff83a74b3390 : 0xffffff80180db7cb
0xffffff83a74b34c0 : 0xffffff80180dae99
0xffffff83a74b36a0 : 0xffffff80180d67ff
0xffffff83a74b3ae0 : 0xffffff80180c8426
0xffffff83a74b3b30 : 0xffffff80180c8722
0xffffff83a74b3d10 : 0xffffff80180b688d
0xffffff83a74b3d30 : 0xffffff8018052273
0xffffff83a74b3d60 : 0xffffff801803364e
0xffffff83a74b3e00 : 0xffffff801802ad1c
0xffffff83a74b3eb0 : 0xffffff8018031cb4
0xffffff83a74b3fb0 : 0xffffff8017ed6aa7
BSD process name corresponding to current thread: kernel_task
Mac OS version:
13B42
Kernel version:
Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64
Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393
Kernel slide:     0x0000000017c00000
Kernel text base: 0xffffff8017e00000
System model name: iMac14,2 (Mac-27ADBB7B4CEE8E61)
System uptime in nanoseconds: 12820415934322
last loaded kext at 7467807388832: com.parallels.kext.vnic     9.0 24172.951362 (addr 0xffffff7f9a596000, size 20480)
last unloaded kext at 7198194523509: com.sophos.kext.sav     8.0.14 (addr 0xffffff7f9a596000, size 20480)
loaded kexts:
com.parallels.kext.vnic     9.0 24172.951362
com.parallels.kext.netbridge     9.0 24172.951362
com.parallels.kext.hidhook     9.0 24172.951362
com.parallels.kext.hypervisor     9.0 24172.951362
com.parallels.kext.usbconnect     9.0 24172.951362
com.sophos.kext.sav     8.0.14
com.devguru.driver.SamsungACMData     1.4.14
com.devguru.driver.SamsungACMControl     1.4.14
com.devguru.driver.SamsungMTP     1.4.14
com.devguru.driver.SamsungComposite     1.4.14
com.apple.iokit.SCSITaskUserClient     3.6.0
com.apple.driver.AppleUSBODD     3.3.5
com.apple.filesystems.smbfs     2.0.0
com.apple.driver.AudioAUUC     1.60
com.apple.driver.AppleHWSensor     1.9.5d0
com.apple.filesystems.autofs     3.0
com.apple.driver.AGPM     100.14.11
com.apple.driver.X86PlatformShim     1.0.0
com.apple.driver.ApplePlatformEnabler     2.0.9d1
com.apple.driver.AppleUSBDisplays     360.8.14
com.apple.iokit.IOBluetoothSerialManager     4.2.0f6
com.apple.driver.AppleMikeyHIDDriver     124
com.apple.driver.AppleMikeyDriver     2.5.3fc1
com.apple.driver.AppleHDA     2.5.3fc1
com.apple.driver.AppleUpstreamUserClient     3.5.13
com.apple.iokit.IOUserEthernet     1.0.0d1
com.apple.driver.AppleLPC     1.7.0
com.apple.driver.AppleSMCLMU     2.0.4d1
com.apple.GeForce     8.1.8
com.apple.Dont_Steal_Mac_OS_X     7.0.0
com.apple.driver.AppleHWAccess     1
com.apple.driver.AppleBacklight     170.3.5
com.apple.driver.AppleMCCSControl     1.1.12
com.apple.driver.AppleThunderboltIP     1.0.10
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport     4.2.0f6
com.apple.driver.AppleIntelHD5000Graphics     8.1.8
com.apple.driver.AppleIntelFramebufferAzul     8.1.8
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless     1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib     1.0.0d1
com.apple.BootCache     35
com.apple.driver.AppleUSBHub     650.4.4
com.apple.driver.AppleUSBEHCI     650.4.1
com.apple.driver.AppleFWOHCI     4.9.9
com.apple.driver.XsanFilter     404
com.apple.iokit.IOAHCIBlockStorage     2.4.0
com.apple.driver.AppleSDXC     1.4.0
com.apple.iokit.AppleBCM5701Ethernet     3.6.9b9
com.apple.driver.AirPort.Brcm4360     800.21.45
com.apple.driver.AppleAHCIPort     2.9.5
com.apple.driver.AppleUSBXHCI     650.4.3
com.apple.driver.AppleACPIButtons     2.0
com.apple.driver.AppleRTC     2.0
com.apple.driver.AppleHPET     1.8
com.apple.driver.AppleSMBIOS     2.0
com.apple.driver.AppleACPIEC     2.0
com.apple.driver.AppleAPIC     1.7
com.apple.nke.applicationfirewall     153
com.apple.security.quarantine     3
com.apple.iokit.IOSCSIMultimediaCommandsDevice     3.6.0
com.apple.iokit.IOBDStorageFamily     1.7
com.apple.iokit.IODVDStorageFamily     1.7.1
com.apple.iokit.IOCDStorageFamily     1.7.1
com.apple.iokit.IOUSBMassStorageClass     3.6.0
com.apple.kext.triggers     1.0
com.apple.iokit.IOSCSIArchitectureModelFamily     3.6.0
com.apple.driver.AppleUSBAudio     2.9.3f17
com.apple.iokit.IOFireWireIP     2.2.5
com.apple.iokit.IOSerialFamily     10.0.7
com.apple.driver.DspFuncLib     2.5.3fc1
com.apple.vecLib.kext     1.0.0
com.apple.iokit.IOAudioFamily     1.9.4fc11
com.apple.kext.OSvKernDSPLib     1.14
com.apple.iokit.IOAcceleratorFamily     98.7.1
com.apple.driver.AppleSMBusPCI     1.0.12d1
com.apple.iokit.IOBluetoothFamily     4.2.0f6
com.apple.driver.X86PlatformPlugin     1.0.0
com.apple.driver.AppleSMC     3.1.6d1
com.apple.driver.IOPlatformPluginFamily     5.5.1d27
com.apple.nvidia.driver.NVDAGK100Hal     8.1.8
com.apple.nvidia.driver.NVDAResman     8.1.8
com.apple.driver.AppleBacklightExpert     1.0.4
com.apple.driver.AppleSMBusController     1.0.11d1
com.apple.driver.AppleThunderboltEDMSink     1.2.1
com.apple.driver.AppleHDAController     2.5.3fc1
com.apple.iokit.IOHDAFamily     2.5.3fc1
com.apple.iokit.IOBluetoothHostControllerUSBTransport     4.2.0f6
com.apple.iokit.IOSurface     91
com.apple.iokit.IONDRVSupport     2.3.6
com.apple.iokit.IOAcceleratorFamily2     98.7.1
com.apple.AppleGraphicsDeviceControl     3.4.12
com.apple.iokit.IOGraphicsFamily     2.3.6
com.apple.driver.AppleUSBHIDKeyboard     170.15
com.apple.driver.AppleHIDKeyboard     170.15
com.apple.iokit.IOUSBHIDDriver     650.4.4
com.apple.driver.AppleThunderboltDPOutAdapter     2.5.0
com.apple.driver.AppleThunderboltDPInAdapter     2.5.0
com.apple.driver.AppleThunderboltDPAdapterFamily     2.5.0
com.apple.driver.AppleThunderboltPCIUpAdapter     1.4.0
com.apple.driver.AppleThunderboltPCIDownAdapter     1.4.0
com.apple.driver.AppleUSBMergeNub     650.4.0
com.apple.driver.AppleUSBComposite     650.4.0
com.apple.iokit.IOUSBUserClient     650.4.4
com.apple.iokit.IOFireWireFamily     4.5.5
com.apple.driver.AppleThunderboltNHI     1.9.2
com.apple.iokit.IOThunderboltFamily     2.8.5
com.apple.iokit.IOEthernetAVBController     1.0.3b3
com.apple.iokit.IO80211Family     600.34
com.apple.driver.mDNSOffloadUserClient     1.0.1b4
com.apple.iokit.IONetworkingFamily     3.2
com.apple.iokit.IOAHCIFamily     2.6.0
com.apple.iokit.IOUSBFamily     650.4.4
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     278.10
com.apple.kext.AppleMatch     1.0.0d1
com.apple.security.TMSafetyNet     7
com.apple.driver.AppleKeyStore     2
com.apple.driver.DiskImages     371.1
com.apple.iokit.IOStorageFamily     1.9
com.apple.iokit.IOReportFamily     21
com.apple.driver.AppleFDEKeyStore     28.30
com.apple.driver.AppleACPIPlatform     2.0
com.apple.iokit.IOPCIFamily     2.8
com.apple.iokit.IOACPIFamily     1.4
com.apple.kec.pthread     1
com.apple.kec.corecrypto     1.0

Your Kernel Panic is occuring when OS X "sees"
com.parallels.kext.vnic     9.0 24172.951362
com.parallels.kext.netbridge     9.0 24172.951362
com.parallels.kext.hidhook     9.0 24172.951362
com.parallels.kext.hypervisor     9.0 24172.951362
com.parallels.kext.usbconnect     9.0 24172.951362
com.sophos.kext.sav     8.0.14
com.devguru.driver.SamsungACMData     1.4.14
com.devguru.driver.SamsungACMControl     1.4.14
com.devguru.driver.SamsungMTP     1.4.14
com.devguru.driver.SamsungComposite     1.4.14
I would recommend by updating all the apps using the files noted above. It is very possible you have one or more that is out of date. If the problem continues then I'd recommend following the developers instructions to uninstall the Sophos antivirus app.

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