Stretched screen on Windows 7

Hi all,
I have windows 7 64 bit running on an A1312 Mac 27" screen. I had XP on it previously and it was running the latest bootcamp on both XP and the current Win 7 install.
The screen is stretched horizontally quite a lot, so much so that I really can't work with any images or graphics. There is no option to change the width of the resolution through the Win 7 control panel.
There doesn't seem to be any option through bootcamp to change it either.
Anyone have any thoughts on how to fix this, the computer is a primary graphics machine so at the moment, it's pretty much an expensive paperweight.
Thanks in advance
AM

You need to correct your profile info, I doubt that you are using a G5.
Did you install windows drivers from the OSX disc?, did you update them to 3.2?

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