I think I need to replace the motherboard on my computer. have already bought a new OEM motherboard. have replaced power supplies, cards, memory, and drives before, but never a motherboard. How big a job will it be to replace the old one? Is there anything I need to know before attempting this? Also, the O/S software is OEM (Windows XP). Is there a way to avoid having to buy a new copy? My understanding is that a new motherboard is seen as a new computer. And if there is a way, is it possible to do so without losing the data on the boot drive? Please let me know if more details are required. Thanks.