How to remover sasser virus from sp2 rc1

hi,
i got this sasser virus but can't detect it.
run most cleaner tools from all type of anti-virus, still came out with
nothing (even from microsoft.).

try to do security patch but can't do any update cos it will say already
have newer file.

tried all recommended methods and still after awhile with internet
connections, it will shutdown prompt for LSA error and shutdown in 60 secs.

please help how to solve this problem.

thanks.