Are you saying that the procedure for turning off auto-play for in the following link does not work completely?http://www.theeldergeek.com/turn_off_cd_autoplay.htm
Then how about doing this way?
Turn off Auto-Play for CD's
1.Go to Start->Run->gpedit.msc
2.Computer Config -> Administrative Template -> System
3.Double click Turn Off Autoplay
Let me know what your results are.