|You can always replace motherboard - but if your machine is a few years old, you will also need to replace the processor, possibly the RAM and if you have AGP grapics card and you don't want to use onboard graphics, graphics card too. Also if IDE drives currently, new boards only have max of one IDE connector (everything moving to SATA). Just looked at spec - it uses DDR RAM and socket 939 processor - both now obsolete, but it does have SATA slots (though don't know if used) and has onboard graphics. So you'd need new processor & RAM to go with new board. Also, powersupply connector may be 20 pin (current are 24, you can get 20/24 adapters).|
After replacing you need to run a repair reinstall for XP (so you'd need an XP install CD).
Bottom line - big job, you could get a new machine for not much more. What's your aim here?