If theactivation isn't done within the assigned time , a lot features of the operating system are disabled.If you haven't activated Windows 7 during the installing procedure, you can activate it manually as well. Then You could meet some problems when activating Windows 7 on your personal computer .
There are 4 usual problems related with Windows 7 activation:
1. Invalid product key when activating Windows 7
The error "Invalid Product key" may happen if you have typed the wrong product key, or the product key does not match the Windows 7 version.There are 6 versions of Windows 7 :Windows 7 Starter,Windows 7 Home Basic,Windows 7 Home Premium,Windows 7 Professional,Windows 7 Enterprise and Windows 7 Ultimate.You should check your product key matching your Windows version. Read more