MpcStar is a pack with an audio player, video player and many codecs. Its interface is quite simple and minimalist and plays most of the video and audio formats such as avi, mpg, mp4, flv, wmv, among others.
It is completely free and has no advertising whatsoever. It is continuously updated to the latest version with the codecs included. They can help you improve video clarity and audio quality, among other things.
During installation you will be asked for a code that you provide on the official website: 3ba0f8d8754122217026fb72dab3df46