yes it is the sasser worm. The same thing happend to me when I reformatted a friends computer.
To get the worm of right after reformat and reinstall, I downloaded SP1 immediately, and when this warning did come up I went into the command prompt and typed in something to stop automatic shutdown, unfortunetly I totally forgot the command.
Once SP1 was installed I downloaded the removal tool from Norton, which can be found on the following page.
http://securityresponse.symantec.com...er.b.worm.html
Then I installed the other updates from microsoft.
Hope this helps, if I find out the command to stop automatic shutdown, I will reply again to this thread.