Upgrading Graphic card's driver (Windows on iMac)

Hello,
I have installed Windows on my iMac using Bootcamp. Everything is running quite smoothly. One of the 3D games I play has a few graphical glitches, though.
I would like to know if it is necessary / feasible / advised to update the graphic card's (ATI Radeon HD2600) drivers under my Windows partition ?
And can this affect in any way my Mac OS X installation ?
Thanks for your answer.

I have the same kind of issue. I play Cabal Online (Europe version) and with my imac, running XP with SP2, there are a lot of glitches(i see bounding boxes, etc) that don't happen when I play on my Macbook. Occasionally I even get a blue screen of death. Any update on this matter? Thank you.

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