John
Thank you, you have raised some very interesting points and areas well worth exploring further. I am currently using Windows 7 (64 bit). A few years ago, I installed 64 bit Office but found when using Access it was unreliable and unpredictable, essentially I had a lot application hangs making it impossible to debug VBA. So I uninstalled the 64 bit version and went back to the 32 bit.

Do you know how I can check which version of Sharepoint I am using now? And which version of Windows 7 I am using ?

I will check the settings you suggest and whether I have the latest drivers for the video card.