Koishii

Hope I have posted this in the correct section...

I have Vista Ultimate 64bit. I have all the updates including SP1 downloaded from Microsoft site. Up until yesterday everything has been working fine for the past month since I built a new system.

Now all of a sudden my computer is crashing on me. No BSOD. Just shuts down and reboots. Last night this occured 5 times in the space of 4 hours..

Looking in my events log all I can see occuring at the times of the crashes is this information:

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\System\drivers\tcpip.sys

I don't use windows firewall as I use the firewall built into Trend Micro Internet Security 2008. Checking though that programs logs shows nothing happening at the time of the crashes.

After googling this and looking on Microsoft's site I am stumped at what I can do to resolve this. I do have windows updates on automatic and I recall an update occuring 2 days ago.

Is there any workaround for this? Would appreciate any help that could be offered.

Cheers
Dave