Windows Media Player setup for DVD Play

I have a Dual DVD RW & CD RW player. I purchased Power DVD 5 for decoder.
I have Windows Media Player 9 loaded.

I would like to play all music CD's and DVD's with same player. After I
opened Power DVD, the DVD file in file types in Media Player is no longer
checked. If I want Media Player to be my default player for music CD's and
DVD Movies, am I suppose to check the DVD box in Media Player options? Or
do I just select the autoplay option by right clicking on my DVD drive and
let Windows XP Professional check whatever it needs?

I just got everything reloaded on my system and I don't want to screw
anything up.