I have windows Vista business with SP1 installed on a Dell Latitude laptop D830. I have run Windows upgrade advisor , it is giving me clear signal to upgrade to windows 7 professional or ultimate. Now with so much news about upgrade problems occurring. Should I upgrade or do clean install? Also I want to know , if there is a difference between windows 7 upgrade and windows 7 full version? With windows 7 full version, Can I get the upgrade option also?