installed windows 7 on dell pc running vista

[angiedavis_591]

i installed windows 7 on vista but where it says change product key i have a product id. and the key on my pc is invalid

 

[mbreslin1954]

You need to buy a license key for Windows 7, the license key on your PC is probably for Vista.

 

[Phillip Corcoran]

The Product Code on your Dell is only valid for the OEM Windows version that was pre-installed on it at the factory.

You need to buy a new Product Key & Licence for your new Windows version.

Easiest way to get Product Key is to buy a genuine Windows 7 DVD from Amazon which is supplied with Licence & Product Key. I just looked on their website, they do still have some in stock.