Separate partition where you can boot into via the boot manager? Then it shouldn't have any effect on your existing XP installation.
I have a system with D101GGC motherboard, Pentium 4 Processor and 512 MB RAM, I installed Windows 7 along with Windows XP... Couldn't find any video drivers for Windows 7... Audio works fine in Windows 7.. Now Audio doesn't work in Windows XP... What to do???