I left this may machine out for lunch, when try to logon get this message:
"The system cannot log you on due to the following error
The parameter is incorrect
Please try again or consult your system administrator"

When i used the wrong password the machine knows
"Did you forget your password?
Please type your password again "

Also happened in safe mode. Any idea what is toasting this machine?

just seems abnormal for a system to just sit there then malfunction without another process

I hv found another same case at different place, what i do is backup the data and reformat the hdd then reinstall windows. Prob. solve but what causing this?