If it's Windows 7 Ultimate, then I'd suggest you look into Windows 7's XP Mode.
If you are looking to dual boot... Most likely, you can't, because the drivers needed to do this simply do not exist.
You will need a driver for the Windows first stage installer for your specific motherboard because Windows XP came out before SATA even existed, and after that you will need XP drivers for the rest of the hardware in your computer. There is a very strong possibility some or all of these drivers simply do not exist. Further, if any of this seems daunting and/or bewildering to you, then you will undoubtedly run into further issues as you go.