i wouldnt have touched a XP install with a glove even , i simply just hate windows..
anyway use samba , this work though it does have some niggles with xp i have heard but i have friends who have installed it fine with both visible drives both ways..
(amiga drives on pc , pc drives on amiga)
cheers
pps:i know u need abit more recent version of samba so please check on aminet etc for latest!!