Security Setting issue

Hello.

I recently created a new user and limited his ability to read certain folders and etc. When I was going to delete group for this user, I accidentally deleted Authenticated Users settings which made my whole entire D: drive unviewable. After that put the Authenticated Users group back and put the default settings back. After I applied that to the entire D: drive most of the folders are viewable again, but some are not. I enabled the built-in admin account to see if it helped if I applied the default settings there but it did not. I also tried restoring my C: drive (since the settings werent changed when I installed windows) with a backup image I created some time ago but that didn't help at all. So now it says I can't access My Documents on the built in admin account and on my account which is also an admin account. It says I need to change stuff in the Security Tab but I already tried that and nothing is working. What do I do?!