[djayawardane]

I have xp, vista 32bit, vista 64bit, ubuntu and opensolaris. I want to install all 5.
1. What should be primary and logical drives
2. What is the order I should install them
3. What is the boot manager I should use
4. Can I install both vista versions

[SaswatPadhi]

You can't have 32-bit and 64-bit OS on same system.

You install these four (in that order) :
(1) XP
(2) Vista 32 bit
(3) OpenSolaris
(4) Ubuntu

Choice of primary and logical drives is entirely yours.

I think GRUB would be best (rather than Vista's boot manager)