This is my first time doing this so I hope I remember everything and don't do something wrong. I have a HP Pavilion 513n. When I woke up this morning there was a message saying "lsass.exe unable to locate component" "This application has failed to start because lsasrv.dll was not found. Re-installing the application may fix this problem." I have rebooted in Safe mode and every other mode and the same same box comes up as Windows XP is loading. I did run a diagnostic test on it under the recovery part and it said all tests passed. I have had this tower for a while and when purchased never received any software with it. Is there a way I can re-install? Please help me.