Shut down, log off won't work

[Chas]

Occasionally, I cannot shut down, log off or run Task manager on my system.
I click on shut down or Task Manager and nothing happens.
I can open and close all applications and use my system normally but I have
to use the case switch to shut down.
System is XP Pro and I have run anti-virus and anti-spyware software,
nothing is detected.
Can anyone help please?

 

[BillW50]

In Chas typed on Thu, 14 Aug 2008 20:25:29 +0100:

Occasionally, I cannot shut down, log off or run Task manager on my
system. I click on shut down or Task Manager and nothing happens.
I can open and close all applications and use my system normally but
I have to use the case switch to shut down.
System is XP Pro and I have run anti-virus and anti-spyware software,
nothing is detected.
Can anyone help please?

I see that once in awhile if Ad-Watch is running. I'll go to shutdown and
Ad-Watch disappears from the tray as well as some other programs and then
bounces back to Windows again. Trying again will result in the same. If this
sounds like yours, I end the task in the Task Manager and I leave it in the
Startup folder so it is always running and I can get to it. In your case, it
just might be a program that causes this problem. If you need help figuring
which one, just post back.