You might also go to the Windows 7 Validation web page and run their validation check ActiveX plugin and see what you get there.
Be sure to do this with IE8 though. Go here to run the check:
Genuine Microsoft Software
You can also try this method too.
To validate that Windows 7 is genuine is to click on
Start, then type in
activate windows in the search box.

If your copy of Windows 7 is activated and genuine, you will get a message that says “
Activation was successful” and you will see the Microsoft Genuine software logo on the right hand side.