Reinstalling Office XP Professional Udgrade

In trying to update my windows XP to SP2 my system hung up and I had to
reinstall Windoxs XP. However, in doing so I lost all programs previously
contained in XP even though the program can stil be found on my C:\ drive.
When I tried to reinstall the Office XP Professional upgrade, my system told
me it could not upgrade because it could not find a qualifying product. How
can I get Office XP professional back on my PC??
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