Try a reinstall over itself.
To do this, shutdown all instances of the player, including disabling it in the Toolbars (right-click the taskbar > Toolbars > untick Windows Media Player in the list).
Then navigate to C:\Program Files\Windows Media Player & double-click on the setup_wm file to reinstall it over itself. Reboot your PC (preferably) & check to see if the problems persist. G