Windows 7 lost my admin account

I had changed my login to automatic. After that I managed to install still programs. But when I started windows again, it didn't let me to change settings which demand admin rights. I'm now a guest and there isn't any other accounts. When I try to make changes in UAC, for example, it demands to log in as admin and "then press yes", but there is no fields to log in and "yes"-button is gray. Is there any chance to get admin back without reconfiguration with Windows CDs. I also tried to recover the system but it demands, of course, admin rights.

Question Info

Last updated March 19, 2018 Views 734 Applies to:
Boot the machine into Safe Mode, then log on as Administrator. If you have not changed the password then it is probably a blank. You will now find that there are several accounts other than Guest. If you reset their passwords then you can use them again.
ID#0128. If this was helpful, please vote by clicking the green triangle. If it solves the issue, click "Propose as answer". Thanks.

Did this solve your problem?

Sorry this didn't help.

Great! Thanks for marking this as the answer.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this response?

Thanks for your feedback.