Hi there and be welcome to our precious forum
The best DVD player software? Well that mostly depends on personal preferences. For myself, there are two programs I like to use (Windows programs that is, I won't mention any Linux products).
1. PowerDVD (I like the interface )
2. VLC Videolan. I posted a thread about this free player a couple of days ago. Visit it here!
Another player called WinDVD does fine as well.
Do you have any special wishes for a DVD playing program?