It seems your media files are already infected. There’s a trojan that infects MP3 and Windows media files, where it tries to modify by injecting script to automatically open users’ default browser and so to visit a malicious website.

So, whenever you play these infected media files, it will keep opening that webpage. Although, these files by itself is not capable to infect your system or other media files, but unfortunately its unrecoverable.

I advise you to immediately download an updated signature from your security scanner and scan your machine.

If the infector is not residing in your machine, it’s possible that you’ve connected your portable media player to an infected one.

How can I solve this?