You'll have to reinstall XP my man, that board with your exsisting os (unless it lived with a similar chipset/cpu config) is like someone attaching a dog's brain to a human's body and expecting it to be able to work.
If you try a repair install, but I would only do that to grab the stuff off there you want to save and then wipe, repart, reformat and do a full reinstall.
A repair reinstall might or might not work, that's the rub, you won't know until you try.
If you have a spare HDD I'd suggest do a fresh install to it then save what you want on the old load by hooking that drive up as a slave, don't hook it up until after you've done the install on the donor drive first though to save you from accidentaly deleting everything on the drive, I've done it and it's a crappy feeling.
Keep your fingers and toes crossed...the real test will be is if it tries to load the chipset drivers for the old mobo when the reinstall is over, that's why it's crashing out now, the chipset's are pretty different and the driver from one won't control the other.
Windows wants to activate, but it needs an internet connection. It wont let me logon unless its activated, but it wont let me set internet settings and it cant autodetect. Wtf.
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make sure that nothing is grounding out the motherboard
try reseating the CPU and RAM
make sure the HSF is installed correctley
try pulling the board from the case and booting it out of the case
try another stick of ram and or a HD if possible
also a possible PSU problem
A repair reinstall might or might not work, that's the rub, you won't know until you try.
If you have a spare HDD I'd suggest do a fresh install to it then save what you want on the old load by hooking that drive up as a slave, don't hook it up until after you've done the install on the donor drive first though to save you from accidentaly deleting everything on the drive, I've done it and it's a crappy feeling.