So I have my (legit) beta keys (one for 32, one for 64). I plan on purchasing Windows 7 as soon as it comes out (barring some Vista-esque show-stopping epic fail). If I start running Windows 7 exclusively (which I know is a risk in and of itself) is there a possibility I may end up with an expired beta/RC but be unable to install a final code release because it is not yet available even though the time-bombs in the beta/RC have expired?