I can't figure out that my Windows is genuine or not. I have key but I can't find from where I can activate it. I have done this so many times in past but this time I can't find any thing at
'My Computer -> Properties' Please see image.
everything key and activation related can be done via command line with the slmgr command
open a cmd (start, run, cmd, enter) and type
You can reactivate your Windows 7 by performing the following:
Hope it helps.