Hi I use a computer with win me( on C) and win x (on D). Recently after I surfed the net and visited some sites then the problem started, and that time I was surfing after booting into xp. Each time I switch on (XP) the following message comes up. " LSA Shell (Export Version) LSA Shell (Exort version) encountered a problem and needed to close. This error occured on 1\30\2005 at 4:46:07 PM (each time this time only it is showing). please tell Microsoft about this problem .... ..... To see what data this error reort contains click here, when clicked the following appeared error signature szAppName:lsass.exe, szAppver:5.1.260011006, szmodnmae:unknown ....... when I click on don't send report the computers behaved ok If Iam using for normal application, but when I connect to the net after some time the following appeares on the screen and system shuts down in one minute, This system is shutting down.Please save the work ..... ..... This shutdown was .....NT AUTHORITY\SYSTEM' Message: The system process D:\win\system32\lsass.exe terminated unexpectedly with status word -1073741819. The system will now shutdown and restart and it shutdowns withina a minute. I think this is sasser virus/worm. sometime back I experienced the same in one of the computers and visited microsoft site and applied a fix and it was made ok. Now I used the following 1.FxSasser.exe 2.STINGER.EXE 3.Windows-KB841720-ENU-V4.exe 4.Windows-KB890830-ENU.exe 5.WindowsXP-KB835732-x86-ENU.EXE but all says no sasser virus on your system. Please help! Regards.