Had a nice little surprise today after getting a brand new computer, I had no audio available in Windows Media Player. This is basically a result of the machine not having the correct codecs – you’d think Microsoft would be smart enough to include this stuff by default, but alas no. Even after upgrading to WMP11 I still had no luck.
After a bit of research, I discovered if you have this problem, you likely need the AC3 codec. Its dead easy to install – just go here, get the installer and install and restart Windows Media Player.