XP is much more fussy about hardware than Win98. However, the problem shouldn't be the motherboard or XP-M. I'd look closely at the RAM (reseat, try another module or one at a time, try diferent slots, etc.), RAM timings and other things. It's a good idea to first memtest the system and tweak the BIOS. When you are error free in Memtest86+, XP should install.
K8N Neo2, Opteron 180, 2GB G.SKILL PC3200, 9600XT, Cooler Master CM 690/RP-600-PCAR
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