You have tried and tried to get your speakes to work. You have the sound card and the speakers; so what is the problem? The first step is to check the connections. Most people accidentally plug the speaker jack into the Line-in Jack of the sound card. Check to see if this is what you did. If you have amplified speakers, make sure that the power is on and mute is not.

Check the volume levels in the system. Check the volume controller in the system tray and also open the advanced audio controls to make sure that there isn't anything muted or at really low levels. Now use several multimedia applications to play various media files to insure that the problem is truly system related, and not limited to a particular application or file. If you find that only a certain application has the problem, such as Windows Media Player or Winamp, reinstall it.