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Your question may already be answered in Windows Vista Security:
http://www.amazon.com/gp/product/0470101555?ie=UTF8&tag=protectyourwi-20
"Jeff" wrote:
> I have Vista Ultimate 32bit.
> I have all the updates including SP1 that I got from Microsoft.
> Looking at my events log I see
>
> Code integrity determined that the image hash of a file is not valid. The
> file could be corrupt due to unauthorized modification or the invalid hash
> could indicate a potential disk device error.
>
> File Name: \Device\HarddiskVolume1\Windows\System32\drivers\tcpip.sys
>
> I dont have any patches or anything not from Microsoft that I know about.
> Is this just a bug or something to worry about
>
> I use windows firewall only and NOD32 for antivirus which comes up clean on
> a full scan
> Thanks for any info
> Jeff