I hope this helps man.
here is some things you should do take my advice.




Because what you have is a virus, You should do A temporary fix that allows you to use your computer to download the patch is to:
Go to Start->Control Panel->Administrative Tools->Services->Remote Procedure Call (RPC)->Recovery Tab and choosing "Take No Action" for all three choices. Its a back door in windows xp. This will allow you to go down load the (fix) before your computer shuts off. Then go to symantec.com and get the blaster worm patch. Or call call hp help#1-800-474-6836.



Could be another issue.



Alternative:





Start->Run...type "services.msc" (no quotes) into the text box. The Services Window opens. Highlight the RPC entry (NOT the RPC Locator) and from the menu bar click Action/Properties... On the properties sheet click the Recovery tab. For First and Second Failures, set to "restart the service." For Subsequent Failures, set to "Restart the Machine." This way you know if the service has failed more than twice, indicating a problem. I also set the restart time to 3 minutes to give myself some time to play around a bit in case the system shuts down again. Hope this helps.