Windows 7: SOME .ogg files can't play anymore

Suddenly I've noticed that certain .ogg files aren't able to be played in Windows Media Player. It only occurs with some files; others play perfectly fine.
For the files that do not work, they open fine but there is no audio or visualisation at all; however, the time bar (or whatever it's called) still shows properly. The files play properly in other media players but I prefer to use WMP.
(I use the codec available here: Directshow Filters for Ogg Vorbis, Speex, Theora and FLAC: Home but although I tried reinstalling it, I still have problems)

Really annoying because I've no idea what's causing the problem

maybe you could try a different set of codecs.
i would uninstall what you are using and try these...

Shark007.net - Windows 7 Codecs - WMP12 Codecs

That made it worse, now ogg files don't even open at all. Instead, they open in another program called MediaInfo that displays information about the file and doesn't play the file at all

Edit: It actually works, it's just that for some reason they didn't open in WMP by default.
BTW, now the visualisation lags, any reason why?

sorry i dont know what you mean by the visualization lags,
little more info?

Its framerate isn't exactly smooth (looks like it's running at about 15 fps)
Just a minor issue but it would be nice to solve it

sorry, not my field. is it the same in a different player.
sorry for the delay, been busy

Works in other players that support ogg... of course that's because they don't have the visualisation thing. Everything else works perfectly