Look at
http://www.chillcam.com and
http://www.webcam32.com , I'm sure they had to have updated to XP by now. Chillcam worked better for 2 identical cams in the past but test them both to see. Chillcam worked better as you could run it on top of itself.
We found that the computer hardware has an awful lot to do with how either perform.
I'm not going to swear that chillcams addy above is correct. lol