"They are only seen as data discs with two folders, audio_ts and video_ts."
In Windows Explorer that's the way they are supposed to appear.
When you left click on the DVD drive, where the DVD is inserted in, there should be a menu item indicating "play", click on it and it should start playing with Windows Media Player.
I'm assuming you're using XP.
Sorry, I should have made myself clearer when describing "open with" .
In Windows Explorer open up the Video_TS folder and highlite any of the .vob files, then right click on it and the open with choice should be available.
I sincerely doubt CloneDVD or AnyDVD has anything to do with your problem.