|You indicate you will be using the old hard drives for storage. Does that mean you want to have Windows on a new hard drive? |
If you intend to use the same hard drive the WinXP is on, then see below.
Windows XP is NOT going to go well, if at all. WinXP does NOT natively support SATA hard drives. So, If you installed WinXP using SATA mode of some sort the new motherboard is sure to have a different SATA controller.
As HopperRox stated above, you MAY be able to perform a repair install, if you have a floppy drive, you slipstream the new SATA controller drivers, or you set the BIOS settings to IDE compatibility mode.
Best to backup all personal files, which you SHOULD be going on an ongoing basis anyway, then try the above.
If your copy of WinXP originally came pre-installed on a brand name computer then all bets are off.
Depending on what hardware is on the new motherboard there is a good chance you won't find drivers for WinXP.
I suggest you just bite the bullet and buy a copy of Windows 7.