Won't accept my serial number; Can't upgrade from trial.

I installed 2014 Platinum trial and then purchased it. I entered the serial number when it prompted me to, but then it kept running trial. When I tried to use it for certain things, it said it was a trial and that I have to enter my serial number. I entered the serial number again, and it said it was already stored in the computer. Uninstalled and reinstalled. Still not allowing me to use the version I paid for. Any suggestions?
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