shutting down while online

does the message box that says it is going to shutdown
also mention something about a remote procedure call?
If so then you have the w32.blaster.worm virus or one of
its variants. If using norton antivirus can go to there
websit to get a removal tool and also need to update your
virus definitions and update your win xp with latest
security patches that would have prevented this.

-----Original Message-----
my system tells me to save all unsaved work as it is
going
to shutdown in 60 seconds.the shutdown is initated by NT
AUTHORITY\SYSTEM.please help me to understand what this
means.
.