Problem with vista license


Apr 23, 2008
Alright so i bought a new 1tb hard drive for my dell xps 630 and i made it my main hard drive. So i installed the vista 64 bit (i used the cd that came with my computer from dell) and now when i try to update the computer it restarts and gives me this error.

An unauthorized change was made to windows.
You will no longer receive notifications, including those about your license or activation. Use the link below to find out how to fix your system.

Error: 0xC004D401
description: the security processor reported a system file mismatch error.

And when i click the link it basically tells me the i have to buy windows 7. does anyone know how to fix this?