Many thanks for your response BC.
It's comforting to know that once I complete downloading Vista 5456, I will be able to install and activate it using my BETA2 keys.
This present build (beta2) is ok but I have a problem with MP11 not playing it's own default music, my MP3's or any music CD's through it (no sound), but Media Center does, so I'm hoping that Vista 5456 will sort this out for me and if it does, then I will probably keep it installed as my main O/S.
Regards
Brave01Heart