A little while back my computer would boot up to the xp logo screen then I would get an error LSASS.exe Endpoint format invalid error message. Then it would restart itself,system restore wouldnt work(even to a long time back). I could start Windows in safe mode though. As it happened I was About ready to reformat the machine back to original condition anyway. But to prevent it happening again I was wondering what the Hell happened. Any Ideas or similar problems?