It's NOT a application programm, it's a Win9x/ME problem.

Another app = same problem. Did you see above I tested more than Xolox. As long as you reboot every 1-2 days you can work without ANY problems at all (windows isn't famous for long uptimes, hehe). Should be okay for normal user, but if this does not satisfy yourself, upgrade Windows (don't forgot to backup all your private stuff).