system shutdown....help

[Guest]

every time i log onto the internet i get a small box that
appears and says... the system is shutting down....please
close all documents and save any information....what may
cause this.... i have defragged my computer and took
unneccessary files off.... please help me if you know...
thanks
grace

 

[Dave Patrick]

This may help.
http://www.microsoft.com/security/incident/blast.asp