How do I disable Automatic Login on Windows 7 when I cannot enter a password?

I used the instructions here:

http://answers.microsoft.com/en-us/windows/forum/windows_7-security/how-to-turn-on-automatic-logon-in-windows-7/99d4fe75-3f22-499b-85fc-c7a2c4f728af

to turn on Automatic Login for my account. I'm the only user and it's only for a gaming machine so there was nothing on the computer I was worried about other people getting to.

But, I cannot run anything as an Administrator. I cannot run some software I have that requires Administrator access because when I try to, the User Account Control comes up and says that I need to enter a password. There is no option to enter a password, the Yes button is grayed out and I can only click on the No button.

I cannot reverse the procedure because of this problem. It asks me to enter a password and I cannot do so.

I cannot use Regedit to disable the automatic login. Regedit will not write the new value, probably because I haven't entered in a password. Or that I haven't run Regedit as an Administrator (which I cannot do.)

I've booted into Safe Mode and have had the same problem.

Is there anything I can do to reverse this procedure?

Thank you.

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