a blaster worm in win2003 is jst similar to that of the sassar which was caused to win xp.it gives a similar one minute timer on connection to internet and a msg inluding REMOTE PROCEDURE CALL error .A simple and better way instead of formatting the drive or booting into CMOS settings can b avoided by jst going to taskbar and then in processes ,click on images to arrange them in alphabet order and in last delete the MSBLAST.EXE file from it.u can over cme with it by jst moving to windows security in www.microsoft.com n then installing a package against this worm