[DanielG]

If you want to use Windows Media Player as your FLAC player, then all you need to do is download a DirectShow codec for FLAC.

You can get it from here:
http://www.illiminable.com/ogg/oggcodecs_0.71.0946.exe
More info can be found here: http://www.illiminable.com/ogg/

All you do is install the .exe file and then Windows Media Player will be able to play FLAC files (as well as a number of other codecs). You might need to create a file association in Windows Explorer so that when you click on a .flac file Windows Media Player automatically opens the file but that's easy to do.