Cnt log on to NT 4.0

A customrs machine boots to where you should get ctrl+alt+del screed, but all you get is win NT splash screen. I looked in the knowledge base andit seems the problem is read permissions to %SystemRoot% folder have been removed. But it doesn't tell how to restore them. Cant log on in safe mode, last known good config. I don't know if it can be done from the repair console or not. He can't reformat because he has 180,000 customers CC numbers(with no bsck up I may add)
Thanks for any ideas,
Jim

If all else fails, get the drive into another NT machine over which you have admin rights. Get his info off and then re-install using the repair option.

See some of the tools here:

<a href="http://www.winternals.com" target="_blank">www.winternals.com</a>

You can find what you need in the admin Pak.