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Have a look at "system rescue cd".

Basically, it'll let you boot into your linux installation (using a rescue kernel). Once there, just install grub again - it'll detect that windows installation and allow you to choose your os at boot time.

http://www.sysresccd.org/SystemRescueCd_Homepage

Alternatively, "Boot repair disk" may be able to do it for you automatically. Just give it a try.