i have heard of several people having problems when using 2 or more partitions. i myself had problems with my newest lappy when it had 2 partitions. first thing i did was lay down a fresh clean install of xp pro w/out partitions
the pc card you were talking about is the vx pocket, there are a couple variations, vx pocket v2 and the vx pocket 440, both can be had on ebay. the 440 is capable of multitracking like 4 tracks but only one digital at a time i believe. these cards are great, i ran one for quite some time with my picturebook, wish i had never sold it. BUT the kicker is they have HUGE dongles with all the inputs/outputs for the card. such a hassle in the field and causes alot of problems when the weight of the dongle pulls it out of the card slightly. i had a custom made cable with only s/pdif in/out. that was sweet!
try this to customize XP for audio:
http://www.musicxp.net/there are definantly some good things in there for us
what kind of batteries are you using for the 410?