Try reactivating by telephone:

Activate Windows 7 manually:
1. Click Start, and in the Search box type :  slui.exe 4

2. Press ENTER on your Keyboard

3. Select your Country.
4. Select the Phone Activation option, and hold on for a real person.

Why do you need to be reinstalling Windows so many times on your machine. If you doing testing or software development, trying creating backup images of your installation which you can restore and use for various scenarios.

http://www.notebooks.com/2009/10/24/how-to-backup-your-installation-of-windows-7/

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Teching It Easy: With Windows |ActiveWin |Notebooks | Microsoft MVP

Hi,

 

Adding to the suggestions of Ron and Andre Da Costa,

 

See How to troubleshoot Volume Activation error codes on Windows 7, Windows Server 2008 and Windows Vista-based computers

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Gokul - Microsoft Support

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