Audit failure on tcpip.sys - Jef

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

Audit failure on tcpip.sys - Jespe

Submit a bug to Microsoft through whatever mechanism you got the beta service
pack. The problem is that the hash listed for tcpip.sys in the manifest file
is not correct.

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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