1. Copy and save or backup the following activation-related files to external storage medium such as USB flash drive or portable hard disk drive:

%SystemDrive%\Windows\ServiceProfiles\NetWorkService\AppData\Roaming\Microsoft\SoftwarePlatform\Tokens.dat

and,

%SystemDrive%\Windows\System32\spp\tokens\pkeyconfig\pkeyconfig.xrm-ms

Note: For 64-bit (x64) OS,%SystemDrive%\Windows\SysWOW64\spp\tokens\pkeyconfig\pkeyconfig.xrm-mshave to be backed up too.

2. Retrieve and record the product key used to install and activate the current Windows 7 or Windows Server 2008 R2.

Tip: If you can’t remember the product key used, there is plenty of product key viewers available to help.

3. Reinstall Windows 7 or Windows Server 2008 R2. When installation wizard prompts for a product key for activation, leave it blank (do not enter anything).

4. In the newly installed Windows operating system, stop the Software Protection Service in Services.msc or with the following command (run in elevated command prompt):

net stop sppsvc 

5. Navigate to the following folder:

%SystemDrive%\Windows\System32\spp\tokens\pkeyconfig\

Note: In 64-bit (x64) operating system, also perform the action in%SystemDrive%\Windows\SysWOW64\spp\tokens\pkeyconfig\ folder.

6. Take ownership and give user full control permissions (alternatively add grant full control right click menu item) to pkeyconfig.xrm-ms file.

7. Delete the original default pkeyconfig.xrm-ms file, and replace with the backup copy.

8. Navigate to the following folder:

%SystemDrive%\Windows\ServiceProfiles\NetWorkService\AppData\Roaming\Microsoft\SoftwarePlatform\ 

9. Take ownership and give user full control permissions (alternatively add grant full control right click menu item) to tokens.dat file.

10. Delete the original default tokens.dat file, and replace with the backup copy.

11. Restart the Software Protection Service in Services.msc or with the following command (run in elevated command prompt):

net start sppsvc 

12. Register the product key for Windows 7 or Windows Server 2008 R2 with the following command (run in elevated command prompt):

slmgr.vbs -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx

Replace xxxxx-xxxxx-xxxxx-xxxxx-xxxxx with the actual product key.

13. Windows will activated instantly, off-line. To check activation status, uses of of the following commands:

  slmgr.vbs -dlv 

  slmgr.vbs -dli 

  slmgr.vbs -atoare