For disabling Auto Insert Notification the entry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Cdrom
should be changed to 0 (zero), not 1.
As for the different values on the nodrivetypeautorun value (not allowing autorun for certain types of disks, even if AutoInsert Notification is enabled) look here:
http://www.jsiinc.com/sube/tip2300/rh2316.htm This is mandatory for Win2000, on XP you can alter those settings via thr rightclick context menu as well.
The autorunalwaysdisable is not relevant... it's made by Windows for certain CD-ROM devices which don't support autorun at all, and should not be altered.
For altering the above values you MUST be logged in with full administrative privileges, else it won't work.