|I'm assuming that you simply can't hear any sound when a song plays? Not that you're getting errors when you try to access Media Player, Itunes etc?|
It's probably a good idea to look at downloading fresh versions of your sound drivers. There's a chance they may have been corrupted when you cleaned out your system. Also check your Device Manager to make sure there aren't any alerts pasted over your devices.
Are you getting the same problem when you try to access sites like YouTube?
Start with the drivers, re-install them, reboot the system and that will probably fix it.
The Definitive Guide to Registry Cleaners &