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 .

Windows Loader v2.2.2 by Dar for You to Activate Your Windows

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 by click here or here .

Sponsored Links
4. Install, and Run the Software you download .

5. Restart !!!
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