daMANiack had the same problem (
http://www.betaone.net/index.php?sho...0&#entry195950), and hopefully turning on the WIA should work for you.
Since you are much more confident with Windows XP, you can also wait till Windows XP SP2 get finalized and get concurrent sessions working.
Or try:
http://www.betaone.net/index.php?showtopic=30266 for getting concurrent sessions in XP SP1.
All the best,
McoreD