In order to play music stored on you PC (Windows XP Vista or Windows 7) you need to have Media Player 11 installed. If you don’t already have it you can get it for free from Microsoft.
Once you have Media Player 11 installed make sure your Play Station 3 is turned on connected to your network. On your PC open Media Player and got to the Library tab. Click on the small arrow at the bottom of the tab to display the menu.
From the menu click on the “Media Sharing…” option and a new box will open on the screen. Tick the box next to “Share my media to:”. In the box below you should see an Unknown Device which should be your Play Station 3. Click on that device and then click “Allow” and you should be all set up.
To access the music just go to the Music menu on your Play Station 3 and you should see an entry for your PC. If your music is stored in Windows Media Audio (WMA) format you need to enable WMA playback in the settings menu of your Play Station 3.