To Activate Windows 7 you need a Windows Loader :
What is Windows Loader
Windows Loader is tool for you to activate your Microsoft Windows . It can activate Windows Vista, Windows 7 Ultimate , Windows 7 Professional, Windows 7 Home Premium .
I give you trial product but once you are satisfied and you have enough money , I highly recommend you to buy windows 7 product key to support the developers .
How to Activate Windows with Windows Loader v2.2.2
1. First you are required to disable the anti-virus system TEMPORARILY. (Anti-virus companies won’t allow activating pirated windows & office copies)
2. You go : Control Panel => System and Security => Change User Account Control Settings => Never notify
3. Download the Latest Version for both 32 bit and 64 bit OS click here .
4. Install, and Run the Software you download .
5. Restart !!!
You can watch this video to know how to use Windows Loader :
New feature of Version 2.2.2 (04/03/2014)
* Added a valid OEM SLP key for Windows Server 2012 R2 Standard (it was taken from a Dell server)
* Added support for Windows Server 2012 R2 operating systems
* Added a warning for virtual machines created in VirtualBox that are using Windows Server 2012 or 2012 R2 (use ICH9 for the loader to work)
* Added lots of new keys, SLIC’s and certificates
* Allowed the loader to be installed onto Xen again (if it doesn’t work for you then it can’t be fixed)
* Cleaned up the UI
* Other minor tweaks and fixes