Gidday Digitalsmoke, admitedly it is a good feeling when someone takes a couple of minutes of their time to reply to your post when ya need a hand with something
... so anyways this should see you right .... I was having the same problem with XP myself, there seems to be an issue with XP reverting back to 60hz refresh rate whenever ya load up a game, whether they've fixed it yet in an XP update yet I don't know. Just get hold of the latest version of PowerStrip which includes support for XP and it lets you lock the refresh rates for individual resolutions and a whole crap-load of other stuff, it did the trick for me
Hope this helps you out.
Cheers,
FireLord.