How can i put my windows 2000 safe from lsass.exe virus

Hi All,

I have Windows 2000 server sp4. Installed Macfee anti software on windows .

ERROR : The system process LSASS.EXE terminated unexpectedly with status code -1073741571. The system will now shut down and restart.

Even i installed
sasser anti software but no help from those software. Please any body help me out from this virus