Remove that file. It doesn’t have anything to do with Windows or the Windows Media player. And 3 av utils is not a good idea. They can easily conflict with eachother. Better is just to leave Avast on the system and use online scanners to double check.

1 spy-/adware remover isn’t enough. There is so much of that garbage out there that there is no application that can handle/recognize them all. I suggest you use Spybot s&d, Ad-Aware and HijackThis.