Just uploaded the latest Catweasel MK4 drivers for Win XP to the Zone.
I have used these successfully on my new machine buiild with XP. I am getting the SID problems that others are experiencing but the floppy etc is working fine. Also, I am not getting any boot up or shut down errors with these drivers.
If Win XP hangs when booting after you have installed the card and drivers - check that your floppy cable on your floppy drive is the right way round! if not Win XP may not boot up and just hang!