Install both hard drives, decide which one is designed for xp and which for vista. Boot from xp cd and choose the hard disk you want to install to. After installation of xp finished insert the disk with vista. Run setup.exe, when it asks you about location for future system choose another drive. And follow instructions. Once installation has been completed you will have dual boot.
Yes. There is a process called Dual Booting, but it requires two hard drives. Just search for "how to dual boot windows vista and windows XP?".
Get Linux!
Yes, this would work. Yes. XP has to be installed first though because Vista does not allow the dual boot with older operating systems being installed after Vista Bob!!!!!!!!!!!!!!
Two. One for Windows XP and one for Windows Vista.
XP, if you can scratch Vista and go for Windows 7
You could use Boot Camp to make a dual-boot for Windows XP, Vista or 7 and Mac OS X. You can then install Insanequarium in Windows
Ideally, Windows XP should be installed first, although it is possible to do it Vista-first.
On a computer with both Windows Vista and either Windows XP or Windows Server 2003 installed, Windows XP or Windows Server 2003 deletes any existing System Restore points belonging to Windows Vista during boot. Microsoft confirms this issue but maintains that it is a fundamental function of the way XP works and cannot be changed. According to Microsoft, the solution is to install Windows Vista on a separate partition invisible to XP.
You can dual-boot virtually any operating system with Vista.
Yes, you can but you have to check the hardware part of your computer. Also you need the upgrade version to keep your files and programs, otherwise you have to format.
Yes. Doing so isn't particularly difficult, and most Linux installation discs can guide you through the process.
Yes Partition Your Hard drive into 2 "partitions" and it will Dual Boot. See: http://www.pcworld.com/article/73826/stepbystep_partition_your_hard_drive.html