I bought Windows 7 Professional Retail which I installed on my laptop. Now I've decided to move it to be on my desktop PC, so I uninstalled Windows from my laptop, restoring the original OS that came with the laptop (Vista Business), and installed Windows 7 on my desktop PC. The problem is that I cannot activate my copy of Windows 7 on the desktop PC. Every time I try to activate it I get the error message:
The product key you typed cannot be used to activate Windows on this computer
and the code of the error is:
Description: The activation server determined that the specified product key could not be used.
How can I solve this problem?