Hmm...it looks like you have that worm people had ages ago, and you obviosuly didnt get the protection for it
It shut down somethnig which caused it to start the shutdown when it recognised a internet connection
On another computer, go to google or something and look for a fix for a worm called Blaster. It should come down as a fix that should search for it, then stop it from happening again. If it doesn't stop it happening lok for the microsoft fix to stop it from happening again
This link might help:
It has all the fixes for all the varients of the worm. Download them both from another pc. Also clcik the link to microsoft to stop it from happening
Then restart the other system once you have it on disc, and take the internet connection out, and run the fix, and it'll find it and eliminate it. Without the internet connection, it wont run the program to shut the pc down.
Sorry about this by the way, i know its annoying
I'll move this to the Software and hardware section by the way, since its more a computer problem than something with windows.