i installed the final version pre retail and everything was great for the first couple of hour but now the screen has gone all blocky for the screen saver and the edging of headers like in the internet. i cant even see the x symbal in the corner of screen as the area is too distorted. dont know what to do. can use the system still as not effected main internet pages etc but just a pain otherwise.

As of this date, the final versionof Windows 7 isnot yet available to end users. I suggest you wait until you have a genuine Windows 7 DVD for installation. Carey Frisch

That sounds like sage advice.