Well I decided to uninstal 3.5 as the 4.0 Beta is performing well. I had to locate the uninstal exe in the 3.5 program folder, but the uninstal went well seemingly. However the 4.0 entries disappeared from the Start menu and the 'add/remove programs' and desktop shortcut vanished. Anyone know why? The 4.0 folder still exists okay in Programs (including an uninstal exe if needed later) and the program itself seems to be functioning normally.