Havent tried yet mate, but ill give it a go, incidentally, the version im running isnt from an actual dvd, i purchased the game via download from play.com, not sure if this would make any difference though.thats really strange, have you tried re installing it ?
i had a few problems with grid the other night
Currently on xp32 home on my rig chaosophy, though i do have 4bg of ram installed.Seem to remember grid having issues with 4GB and x64 o/s on some machines, think I remember having issues with it myself. Not getting it to run etc.
Think I ended up getting an app that patches exe's with a 4GB fix.