I have unplugged it and let it rest for a few days, so I powered on today and it's still stuck on "logging off", how can I fix this????

For the Windows Vista operating system, (All versions);

Go into Safe Mode. Let the computer run in Safe Mode for a few minutes. 5 to 10.
Then restart the computer.

1) Using the F8 method;
A) Turn the computer on. AS SOON AS you press the Power On button, start tapping on the F8 key. Tap in 2 second intervals. (1001,..1002)

If you hear a beep as you are tapping on the F8 key, disregard it.
It is a Stuck Key error code.
The computer 'thinks' you have a stuck key on the Keyboard.

The reason you are tapping right away, is the window you need will pass by VERY quickly. Using this method there is no chance of missing this window, and the small window of opportunity.

If you have never been in Safe Mode;
The computer is in a Very basic mode. The icons on your desktop screen will reflect this. All graphics shown will reflect it. Safe Mode is a program built in that will automatically rectify problems, and return your computer to the state it should be in.

I would appreciate hearing back from you in this matter. Please post in a Comment.

Apologizes for the lateness in providing a solution to your problem.
I see you connected to me, and due to this recent event, I looked at your problem/s.

Regards,
joecoolvette