thank you for all your earlier answers I now have all the info . the box saying system shutting down comes up with the words This shutdown was initiated by NT AUTHORITY/SYSTEM windows must now restart because the Remote Proceedure Call service terminated unexpectedly .It is a Packard Bell computor (not Patriot ) and is on windowsxp. I tried Shybears theory but it did'nt work
Follow this link, www.grc.com and look for the dcombobulator (I kid you not). It is a small freeware program that closes the port which the blaster virus exploits.
Thanks travelcard I managed to follow your instructions and got rid of the bug . One thing I found though the internet reinstatement instructions did not work but I just had enough time to download the patch before my computor knocked itself off