Do I need to activate Windows after making a hardware change?
Maybe. When you make a significant hardware change to your computer, such as upgrading the hard disk and memory at the same time, you might be required to activate Windows again. For more information, see Activate Windows 7 on this computer.
Having bought a bona fide copy, you shouldn't have to pay anything. Have the product key to hand so that you can enter it if needed.
There is a small program that will stop this happening and will reset your computer back to within the 30 day period, so you can register it no problem.
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