Windows 7: Admin access not available, Win 7 Pro.

I am using my desktop as a guest and cannot get on as administrator. I may have done something silly to make this happen, messing about with account perms and such when I got my MCITP book... Can use the computer a s a guest but I can't use Restore Point, can't use Run as Administrator, SpyBot has found issues I can't deal with without Admin access and neither can I do a back up before a wipe and reload. I have tried net user * from cmd and also OphCrack-which did find my guest password, but also said Admin account was Disabled. This problem was discovered when I tried remoteing in from my laptop. I have "something" in my D drive but doesn't look big enough for a recovery partition (9.8G).



Any ideas???

See here, see if that helps: Built-in Administrator - Enable from WinRE