Restore administrator account in Win XP Home

I've inadvertently changed an administrators account to a guest account.  Now I can't view other user folders nor make any system changes.  I've tried to set up an another admin account with no success.  Will I have to reinstall or is there a quick fix for this problem?

Any help appreciated.
rpollittAsked:
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aadihCommented:
Could you restore your computer to an earlier date?  The quickest and easiest solution.
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rpollittAuthor Commented:
No, I can't do a system restore because the PC is logged on as a guest account.

Thanks
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aadihCommented:
Can you boot up in safe mode with command prompt and run "rstrui.exe". (Without quotes.)

May not work, but it's take only a few minutes to try.  Worth it?
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rpollittAuthor Commented:
Tried it.  No go.  I think I'm going to have to reinstall.  What a pain, but it has to be done.  Curiously, this issue surfaced after installing Service Pack 3 and the additional updates.
Thanks for your help.
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Ricardo MartínezInformation SecurityCommented:
Boot up in safe mode, open a terminal and type
control userpasswords2

Open in new window

maybe you can access the User Control Panel and change it back to administrator.
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aadihCommented:
Yeah, Reinstall. :-(
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Ricardo MartínezInformation SecurityCommented:
You can also try to repair the installation using the Windows XP Install CD, it's faster than a reinstall.
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Darr247Commented:
I suggest booting from PNH's Password Recovery tool and viewing the list of users to see if there isn't another Admin-level user of which you're unaware... if so you can blank or change that user's password so you can logon with Admin-level access and change the Administrator user back to Admin-level.
Refer to http://pogostick.net/~pnh/ntpasswd/walkthrough.html if you've never used that tool before. Note also the option near the bottom of that page to
3 - Promote user (make user an administrator)
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rpollittAuthor Commented:
I appreciate all your suggestions, folks.  I gave up and formatted and reinstalled.  Thanks again.
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aadihCommented:
Great. You got it working. :-)
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