I cant log in to my IBM390X Thinkpad

I can not boot up or log in to Windows 2000 Professional on an IBM THINKPAD 390X

I recieve this message :” NTDETECT failed” then the compputer freezes up.

The computer also has a win95 version on it which I can log into. But there is no response from Win 222 Professional

Please help ! Sorry I only have 135 points to give.