Just go to isohunt and download the bloody disk. Get the version that matches your COA, try for one with service pack 2 only since that should work with any key.
Microsoft doesn't care if you have 5,000 windows disks. They care how many coas you have. If you have a license, you can download a copy. Just make sure it's not one of those crappy cracked ones, they never seem to work right.
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Every time you think you've made it idiot proof, someone comes along and invents a better idiot.
?the end of our exploring, will be to arrive where we started, and know the place for the first time. - T.S. Eliot