Windows XP Home ed reinstall cd missing

I have a Win Xp Home ed CD key and a hard drive that needs to be rebooted, but no Windows XP install cd.
I intend to put my hard drive in an external hard drive case, use a crappy computer I got to pull important files off of it (which is also where I got the cd key), then put my hard drive back in the good computer, reformat it, and get the files back from the crappy computer. But after all this, it turns out my old boot cd has gone missing, and I don't know how to get another one. I gave the CD key to microsoft, they said its legit, but that I'd have to talk to HP about a replacement (crappy computer's manufacturer). I talked to HP, and they said it was out of warranty and they couldn't help.
Does anyone know where I could get a Windows XP Home install CD?

Are you or someone you know a student with access to a .edu email address?  If so just download server 2003 and turn it into a desktop os with instructions on the internet
google:dreamspark
google:2003 workstation

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