PC Stats posted a new beginners guides about upgrading a motherboard without reinstalling

You can upgrade a processor or add a new memory module without causing so much as a blip from Windows XP, but a new motherboard can and will cause XP to stop booting altogether. Many have tried, and many have been greeted with the cold gasp of the Blue Screen of Death for their efforts. Fortunately, the procedure for correctly installing a new motherboard is rather easy and straightforward, and more fortunately, we're here to talk you through it. PCstats never-ending quest to save you from computer store labor charges continues... after all, this is the exact same procedure a Service Center will charge you $80/hr to do.

Beginners Guides: Upgrading A Motherboard Without Reinstalling