Here is a list of my top 3 video players on windows.
in no particular order:

1. gom player (http://www.gomlab.com/eng/GMP_download.html)
i love gom players simple interface and good quality audio and video sync.

INTERFACE : 9.5 / 10

PLAYER : 8 / 10

2. vlc media plyer (http://www.videolan.org/vlc/download-windows.html)

vlc is a very simple player that can convert aswell as play movies.

INTERFACE : 6 / 10

PLAYER : 10 / 10

quick time player (http://www.apple.com/quicktime/download/)

apples free windows and mac player has a clean interface and good quality player.

INTERFACE : 8 / 10

PLAYER : 10 / 10

overall in like all 3 players for different uses. if i had to rate them i would put them: 1.vlc player

2. quick time player

3. gom player

thanks