I have two systems...
System #1: Does not have InCD installed. My primary system that I use very heavily. Running XP.
System #2: Does have InCD installed. Not my primary system, and thus I don't use it as heavily. Running XP.
System #1 uptime since last reboot: 59 days 23 hours (and still going)
System #2 uptime since last reboot: a few days ago
Strange that the system that I use more is actually more stable, huh? In fact, I usually reboot my secondary system about twice a week. Over half of those reboots have been caused by InCD crashing, hanging, or otherwise causing problems. Granted, I had more problems than this back when I used DirectCD... but, eh, you learn to live with it after a while.
Perhaps reinstalling InCD would help. Or making sure that you have the latest version.