There is a fix to re-set WMP 12 to default. Means you lose all your lists you've created but you can start again. If you wish to re-set to default then type msdt.exe -id WindowsMediaPlayerConfigurationDiagnostic in the start search bar. Selact the msdt.exe in the list and a window opens to reset WMP. Select the 'next' tab select 'apply this fix' then click on 'close the troubleshooter' ignoring if it shows further problems.
UK's best mobile network 2016: best 3G, best 4G, best mobile networks revealed