I have CS6 master collection. After update from Windows7 it didn't work. When I try to install again, it says the serial number is invalid. What to do?

I have CS6 master collection. After update from Windows7 it didn't work. When I try to install again, it says the serial number is invalid. What to do?

Please refer to the steps in Re: cs6 serial suddenly invalid.
It should help you.
Regards
Rajshree

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