XP administrator cannot install new programs

When I try to install a program I get an error

"You must be logged in as an administrator to install this program."

I am the only user of XP Home and am registered as an administrator of the computer. I used system restore to go back to a time when this error does not appear, but after the restoration of the system, I got the same error message. I created a new account with administrative privileges with the same error. SafeMode worked OK. I used regedit to verify permissions, and they indicate that I have administrator privileges.

I ran SFC and tested the equipment without any problem. I finally realized I had saved the registry with ERDN every day so I went back at the same time (more than four weeks ago) where the problem has not produced and found that the problem started after I had installed and then uninstalled Comodo firewall but had never removed from my computer. I used Revo uninstaller uninstall, restarted the computer and the problem disappeared.

Thank you very much for your help!

Tags: Windows

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