Windows SBS std 2003 R2 restarting with lsass.exe error after virus infection

After debuging a virus infection and removing a .sys file that was causing a BSOD (and memory dump) on a 2003 SBS server it will load up to the login screen but gets an lsass.exe - application eror saying The instruction at "0x74204c27" referenced memory at "0x00000004"; the memory could not be read.  click ok to terminate click cancel to debug.   Click ok and we get an lsass.exe - system error, object not found dialog and a system shutdown pops up with The system process "c:\windows\system32\lsass.exe" terminated unexpectedly with status code -1073741819. the system will now shut down and restart.