Kernel Panic - You need to restart your computer

Hi

Today, after updating to 10.7.4 have had two Kernel panics and the "You need to restart your computer" messages.

I also yesterday updated the firmware on the Iomega Network Hard Drive that I am using for my time machine back ups.

Below is a copy of one of the Kernel panic logs, unfortunately this really means very little to me. But does this provide any indication as to whether the error is being caused by the Time Machine backup or whether I should be looking elsewhere for a fix?

Mon May 21 15:06:40 2012

panic(cpu 1 caller 0xffffff80004e5f57): "hfs_vnop_link: error 2 updating vp @ 0xffffff801143cc98\n"@/SourceCache/xnu/xnu-1699.26.8/bsd/hfs/hfs_link.c:643

Backtrace (CPU 1), Frame : Return Address

0xffffff807f44b9f0 : 0xffffff8000220792

0xffffff807f44ba70 : 0xffffff80004e5f57

0xffffff807f44bb80 : 0xffffff8000319cc8

0xffffff807f44bbe0 : 0xffffff800030c017

0xffffff807f44bf50 : 0xffffff80005cd61b

0xffffff807f44bfb0 : 0xffffff80002daa13

BSD process name corresponding to current thread: backupd

Mac OS version:

11E53

Kernel version:

Darwin Kernel Version 11.4.0: Mon Apr 9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64

Kernel UUID: A8ED611D-FB0F-3729-8392-E7A32C5E7D74

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

System uptime in nanoseconds: 4546521576118

last loaded kext at 4183687228362: com.apple.filesystems.afpfs 9.8.1 (addr 0xffffff7f810bd000, size 356352)

last unloaded kext at 225296543172: com.apple.driver.AppleUSBUHCI 4.4.5 (addr 0xffffff7f80a91000, size 65536)

loaded kexts:

com.viscosityvpn.Viscosity.tun 1.0

com.viscosityvpn.Viscosity.tap 1.0

com.parallels.kext.prl_vnic 7.0 15055.740667

com.parallels.kext.prl_netbridge 7.0 15055.740667

com.parallels.kext.prl_hypervisor 7.0 15055.740667

com.parallels.kext.prl_hid_hook 7.0 15055.740667

com.parallels.kext.prl_usb_connect 7.0 15055.740667

com.apple.filesystems.afpfs 9.8.1

com.apple.nke.asp_tcp 6.0.1

com.apple.filesystems.smbfs 1.7.2

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AudioAUUC 1.59

com.apple.driver.AGPM 100.12.42

com.apple.driver.AppleMikeyHIDDriver 122

com.apple.driver.AppleHDA 2.2.0f3

com.apple.driver.AppleUpstreamUserClient 3.5.9

com.apple.driver.AppleMCCSControl 1.0.26

com.apple.iokit.IOUserEthernet 1.0.0d1

com.apple.iokit.IOBluetoothSerialManager 4.0.5f11

com.apple.driver.AppleIntelHD3000Graphics 7.1.8

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.SMCMotionSensor 3.0.2d6

com.apple.driver.AppleMikeyDriver 2.2.0f3

com.apple.driver.AppleSMCLMU 2.0.1d2

com.apple.driver.AudioIPCDriver 1.2.2

com.apple.driver.ACPI_SMC_PlatformPlugin 5.0.0d0

com.apple.driver.AppleLPC 1.5.8

com.apple.driver.

Thanks for your help