error after mirroring 2 disk

hi iam getting this error after software mirroring in 2 hdd with windows 2000 server. can ne one pls help me out in this

lsass.exe

directory service could not start because of the following error:

the system cannot find the file specified. Error status

0xc000000f.please click ok to shutdown this system and reboot into directory services restore mode. Click the event log for the more detailed information.