Hi there i upgraded to xp from win 98 around a year ago i had the same problem.
the solution was easily solved, i upgraded xp to service pack 3 and uninstalled internet explorer i use firefox now as it has some conflicts with xilog and pannel mac. I also upgraded xilog to the latest version. I have the latest version if you would like it .
I got this info from our service engineer were on a gold service contract so we can call them out at any time at no cost to us.
Since we joined that they like to tell us more to save money at there end lol.