autoplay stop working

My pioneer DVDRW 107 is in master config. and the LG DVD is the slave drive. putting audio cd or dvd or any installation discs in the Pioneer drive did not start automatically. I went to the properties page of the drive and select default ie prompt for action but this does not cure it. My slave dvd drive still works with autoplay. The autoplay only stop with my settings, for other users this still works.
TweakUI suggested the same thing. Windows restore did not fix this either. Would appreciate any help.