Windows media player should come pre-installed on your system and does not cost anything. You likely have malware on your system. I would download Malwarebytes antimalware from here
There is a premium version but just do the free one. Install and run. Let it get rid of the bad stuff it finds. I would also make sure you have an up to date Antivirus software and run a scan. There are plenty of good free ones if you don't have one installed already.
