Lsass.exe system error!!!

hi,

i recently performed a system restore, as several unexpected errors occured with applications such as AGV (which would not start) and WMP11 which would not play tracks. I do registry scans and defrag once a month as well to ensure my pc is kept working well. After completing system restore i booted up my pc and just before login the message 'lsass.exe system error' and about 10 seconds after my pc restarts itself and the same thing happens again and again. I cannot get into windows even using safe mode, and i suspect the problem my be hapening because i could have a virus.

does anybody have any sugestions about the problem or know how to cure my SERIOUS pc problem?

any helpful sugestions will be greatly appriciated

Hi Robin-
This may help: http://www.askdavetaylor.com/lsassexe_system_error_every_time_i_boot_windows.html

Manual system restore

At the Recovery Console command prompt, type the following lines, pressing ENTER after you type each line:
cd system32\config
ren system system.old
ren software software.old
ren SAM SAM.old
ren security security.old
ren default default.old
cd \
cd windows\repair
copy system C:\windows\system32\config\system
copy software C:\windows\system32\config\software
copy sam C:\windows\system32\config\sam
copy security C:\windows\system32\config\security
copy default C:\windows\system32\config\default