Windows 7 is a Beta release intended for technology enthusiasts to download and try out, possibly to report bugs I believe. It's not recommended for everyday use at the moment, it wonâ€™t be commercially released for a little while yet. I would stay with Vista, which is Microsoftâ€™s current most-up-to-date supported system.
Encore 4.5.5 ~ Windows ME
Encore 5.02 ~ Windows XP SP3
"No man ever became wise by chance" ~ Lucius Annaeus Seneca (c. 4 BC – AD 65)