I too don't have InCD installed,but I noticed that this only happens with versions 6 of Nero.I have tried earlier versions of Nero but the problem never occured.
Now I can confirm that its not a media problem and that the problem starts just after the installation of nero(I have tried it on a clean system).
BUT I'm using trial versions of Blindwrite and copy2dvd (but i suppose that it shouldn't matter).
Also only versions of blindwrite AFTER version 5 have a problem with Nero, but all versions of copy2dvd that I tried have this problem.
Hope this helps someone.
Win2000 sp4 with Blindwrite and copy2dvd without the problem occuring, and nero installed ONLY.
4.5.7 and 4.2.5 WORK OK
5.0.1, 5.0.7, 5.1.1, 5.1.5, 5.1.6 all have a problem with nero 6
2.4.17 and 3 have a problem with nero 6
18.104.22.168 Creates the problem
22.214.171.124 plextor version and 126.96.36.199 DOES NOT