Five of my friends yesterday were coming to me with a problem that their computer would give them a message and than shut down. I just KNEW this was something new, and sure enough there was news of a new worm based on that windows exploit.
ANYWAY, this is how you stop the shut down.
1. Run services.msc
2. Scroll down the list until you see Remote Procedure Call
3. Right click on it and select properties.
4. Click on the Recovery tab.
5. Change all 3 boxes from "Restart Computer" to take no action.
This will prevent your computer from restarting.
What you need to do next is apply the patch from microsoft, and than finally delete the virus from your computer.
Search your entire computer for Msblast and than delete the files, there is also a registry key to delete.
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
Find yourself to there in the registry, you will find a "windows auto update" and in the same row a "msblast.exe", select it and delete the value.
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