Hi Gloria,
Are you getting this messages before the reboot?
"This system is shutting down. Please save all work in progress and log
off. This shutdown was initiated by NT Authority/System."
"Windows must restart because the Remote Procedure Call (RPC) service
terminated unexpectedly."
If so you are probably infected with the msblaster virus. You can check out
http://www.microsoft.com/security/incident/blast.asp for information on how
to clean your machine, or let me know if you need help and I can help solve
this issue
--
Mario Guzzi, Developer Division
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