My computer screen keeps freezing and I have to keep turning the computer on and off

[kk5555]

Hello everyone - I am a new member of the forum and hope that someone reading this might be able to help me with a problem I have with my computer.

In recent weeks the computer screen keeps freezing with the cursor being replaced by the hour glass symbol. This usually happens after several hours' computer usage - but sometimes it occurs soon after the computer is turned on.

When this happens, I am unable to log off; the computer on/off button does not work when the screen freezes and I have to turn the computer off at the mains.

In order to be able to log back into my broadband internet connection I have to turn the computer and and off twice and then on again .

Sometimes when the computer screen image freezes a message box appears always saying "End programme" (i.e. "End programme - CiceroUIWndFrame" or "End programme - mixer").

My computer runs on the Windows XP operating system.

I changed from Internet Explorer browser 6 to 7 yesterday but the problem of the computer screen freezing persists.

Any helpful advice on this would be much appreciated.