Permission in NT4

You wrote that he set the permission to No access for administrator...I supposed that you are the admin...can you check if you can log in with any other user credintials with normal previlages?
Are your domain/users added to the power users group in the local machine...
if yes then you can log in and do the changes.
If not do the following:
1. Open User managers for domain from the server...
2. from the menue select user-select domain
3. Type the \\machine name(on whcih you are facing theproblem)
4. double click on power users
5. A screen will appear with "Local group proparities" click on add
6. add a user which is not an admin (any user)the best to add the Domain users group
7. press ok, then again OK
8. Try now to login to that machine with any user that doesn't have the admin previlages
9. change the permission on c: and it's subdirectories to the one you need

Good Luck

I sort of agree with the previous person, but let me continue where they left off.
Go to any machine on the network and log on as a domain admin. Select the machine in question and verify that your userid has admin local priveleges. If not then assign your userid to this local group.
Now for the fun stuff. Do not log into that machine locally. Connect to the hidden drives (C$,D$) and go to the properties on the drive.
Go to Security and reset the NTFS permissions for the drive including all subdirectories. If this does not work then take ownership of the directories

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