Enabling UAC is logging me off at startup

[Guest SSI]

I have been having problems with the control panel basically the uninstall

programs panel is corrupted and someone told me to re-enable the UAC under

my profile. Well, as soon as I re-enabled it I could not log on to Windows!

The computer restarted and on the log on screen when I clicked on my name

and put in the password, windows started logging on normally (saw the

welcome sign) ... and immediately the logging off message appeared. I tried

a couple of times with the same results. Fortunately I had created a restore

point prior to the change and I was able to go back. How can I fix this UAC

problem? Maybe this is related to my control panel issue.

Thank you for any suggestions.