Activated my copy of GC2 a month or so ago by email.
Everything seemed to work without a problem.
Then I had a few problems with my hard disk that resulted in a reformat (Non GC2-related).
Have reinstalled GC2 and put the file thingummy file back but it now gives an error message along the lines of ...
'Product validated but serial # or machine SID don't match'

Do I need to go through the activation process again? The only details I entered in last time were my email address and the serial #. Neither of those have changed ...