Creative Labs = evil

Anyhow, Disc Detector (the c being important here) is a program it runs to see when you put in an Audio CD. Some reason, they didn't tie into the standard autorun part of Windows.

Not sure what OS you are on, but if it's 98, ME, or XP, do a Start - Run - MSCONFIG, and disable it there. 2000, not sure where it sits in startup, so you may have to go registry hunting.