Cyberlink power media 14 will not play. It says that player is currently running and needs to be closed before proceeding.

SOURCE: Unable to play DVDs in Windows Media Player & Power DVD

may be if you instal the codec pack wil works
here is the link for download:
http://www.codecguide.com/download_mega.htm
you got to instal in wmp

SOURCE: Cyberlink DVD Error 80040216 error code

I would un install it and re install it and try again also trying VLC or windows media player classic

also see here http://www.rm.com/Support/TechnicalArticle.asp?cref=TEC1415974&nav=0&referrer=SupportHome

SOURCE: dell xps 1640 vista cyberlink power play

it is all in the settings. If it does not let you into the settings you need, that means you do not have it configured right for it to notice how you are running it.

SOURCE: Media Player will not play a DVD with an external projector

INSTALL KLITE CODEC PACK
AND UPGRADE MEDIA PLAYER TO VERSION 11 IT SHOULD BE ABLE TO PLAY DVD,S NOW

SOURCE: just purchased an acer aspire one, can get movie

AVS DVD Player is a free universal player that I put on all Acer Ones that I sell. It is an excellent player, that can go full screen and handle every format. It will even play VOB files which are dvd files "ripped" from dvd discs. I have never had a failure with this program....

http://www.brothersoft.com/avs-dvd-player-free-44678.html