graphics card may not be configured properly

[malaus]

I am running a 2 year old unit with an Intel Celeron CPU with XP Professional on which I have installed Office 2010.
It has not missed a beat until something I did caused a message to be displayed -

"PowerPoint has detected that your graphics card may not be configured properly for an optimal slide show experience".

I have had this problem before and cured it but have forgotten what I did. I have a vague recollection that the problem stems from Internet Explorer.
Can someone help.

[Medico]

It may be worth checking the graphics card web site for new drivers, or to reinstall the drivers. This could very well be corupted drivers.