I just uninstalled the trial DVD players I had messed with this weekend, and kept Media Player Classic, as refrenced above. It works perfect. All I did was place the program on my C: drive and associated DVD *.IFO files and *.Vob files with this program. Just right mouse click on these files and choos to open with this program, which you might have to browse and find. This is a big relief. All weekend I have been fighting rundll32 errors, associated with trying to get DVD files to play without investing in an expensive program. Also, some of the programs turned off Aero, which isn't the end of the world, but it was annoying.
A bonus, at least in my opinion, is that I can capture still frames of DVD with the simple "print screen" key on my keyboard. Other fancy DVD players in the past would not allow this, probably related to overlay. Maybe this is a benefit of the new graphical Aero interface, or the way this particular player displays DVD. Either way, the DVD looks great with this free player.