For both machines be sure you do the following changes before you install Hoster.
http://www.mtu.com/upgrades/hoster/v...de-hoster4.htm
http://www.mtu.com/upgrades/hoster/xp-changes.htm
For your Vista laptop it needs to have at least 2GB of memory. For XP you need to have 1GB. Both need video with 128MB+ to function best. Unfortunately many lower end laptops use "Shared" memory for video which can cause some problems that may have to be worked out, by stopping some of the unneeded processes that Windows likes to start.
As to the 64 bit OS Microstudio will not work correctly on that machine and I am not sure all the other Suite programs will either.