hey all,

Just a note to let you know, I have fixed it on my PC.

The problem did indeed turn out to be that I had Antialiasing and Anisotropic Filtering turned on the the video driver.

Check your driver and make sure they are set to 'Application Controlled' The setting is under 'Quality and Performance Settings' under advanced in display properties settings tab.

To make that easier to follow,
Right click desktop, choose properties.
Select the settings tab at the top
go to advanced.
In the new box, choose the tab labelled with your video card.
The tab should also have the nVidia logo on it.

When you click this tab, a menu will pop out to the left. On this menu, choose 'Performance and Quality settings', and you should see 'Antialiasing settings' and 'Anisotropic Filtering' in the lower half of the dialog box.

Good luck all