I have also had the problem of Xolox 1.5 shutting down. I'm using XP Home w/sp1 installed. Something new that I have also noticed is creepy little ?pop-ups? / ?searches? namely:
Yashar-Oboz
I-MediaPopAD

Could one or both of them be the problem? ( hey, if they aren't the problem, can anyone tell me how to block these unwanted guests? )