I run JRiver with BD on lesser systems than that. However were all Windows 7 machines (Vista and above gives you the option to use WASAPI mode). I've the perfect setup for the OP....here's a setup in XP tailored to your device!!!!
http://www.computeraudiophile.com/blogs/jud-the-prof/how-set-jriver-media-center-win-xp-pro-music-streamer-ii-usb-dac-144/
Follow this and you should be back in business without the skipping!!!
prerich's post in J-River "skipping" was marked as the answer