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23 Jun 2012  

Windows 7 Home Premium 64bit
Can't activate after new motherboard


I have Windows 7 Home Premium 64bit.

Recently my PC died, and was diagnosed as needing a new motherboard, which I now have. Windows had to be re-installed, but when I try to enter my product key from the sticker on the DVD case, it comes up "Invalid character" when I try to enter the 4th from last character (which is definitely an "8").

What do I do please?
My System SpecsSystem Spec