DELETE THIS POST it is Obsolete Can I do This ?

I don't think, though I could be wrong, that you can dual boot both 32 and 64 bit Windows 7. You certainly could set up dual boot with Windows 7 and XP Pro though. And, yes, you can hook up two computers to one monitor, though, of course this depends on the monitor and only one computer could drive the display at once. I do this, I have a newer computer with Windows 7 and a fairly ancient one with Windows ME on it (to play very old games on) both connected to my display.

You can install all 3 (should be ok with 64 bit and 32bit mixing)as long as they are on there own partition and you shouldn't lose anything, but it is always good to back up what you want saved just incase something does go wrong.

Not sure about hooking up 2 pc's to 1 monitor, possibly could be done although I would think you would need a switch.

VGA,CRT,DSUB are all the same connection just different names.

cool thanks for the info