Win7 double install.

Guys Im in a pickle here.
I bought win7 upgrade version and did a clean install on new computer that I made, by double installing it. But then I activated it but then my dad used to the same key to upgrade his Win 7 starter to home premium.

Later after few days my mobo got faulty and had no sound so I sent to get RMA to newegg and got new one.

BUT here the deal when try to double install and activate my key.
IT DOESNT WORK????????????

Why?
Could some one possibly provide me with solution.

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