I went ahead and installed enterprise on my laptop and have been using it since it has been on the ms software assurance page (and before we got the keys). Now the problem is i no longer work at the place that has the licenses and i need to convert my enterprise installation to professional/ultimate or anything i can buy a key for. It is imperative i do not reinstall as i have everything setup just perfect. I have tried the ProductID hack in the registry to no avail. Does anyone know a way i can preserve the installation (programs, drivers, most importantly firewall settings) and change versions? Thanks.