Scratched Win Xp pro disc ???

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I'm having to do a re-install of xp pro, problem is my disc is heavily scratched and i've tried twice to do an install with no luck as files showing as they can't be read from disc.
Can anyone recommend any way of getting round this, other than buying a new copy of xp? Ie can i use a friends disc, and then install my cd key or do i have to buy new?
Thanks

 

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Thanks guy's, just didn't want the hastle of the re-install just to find out it wouldn't work lol

Thanks again.