Hi Churky,
Please read the following thread (you could use Search feature here

)
There are reports about some problems re: Cyberlink Power DVD 9 but most importantly it seems like there is solution and it looks like you don't need to uninstall CIS in order to run the player
https://forums.comodo.com/empty-t42052.0.htmlI hope that will help
I am sure developers will fix that. I have no doubts about it...
... but in any case even if that may not currently work for you - you can temporarily use any excellent free media players for DVD playback:
- VLC (the best in my opinion) ... no codecs required;
- Media Player Classic;
- some users of this forum are using Korean Media Player KMPlayer) (no codesc required)
I can name a few more...
They can be downloaded from
http://www.free-codecs.com/index.htmand KMPlayer from
http://kmplayer.en.softonic.com/My regards
p.s. it would be helpful if you provide info about OS you are running and probably some other details (other security software you are using, anything running in the background, etc.)