How to re activate Win7 on new hard drive?

I had windows 7 installed from Vista on my laptop at local shop but had to replace hard drive. When I went to reinstall it with my product key and the disc given to me by shop, it stated please enter correct key. I put my old hard drive in and limped along to verify that the key was correctly entered. Any ideas? TIA!
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More about activate win7 hard drive
  1. call microsoft and do it over the phone. never had a problem doing it like is a link that explains it.
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