Song is in the database, but it won't play: There are no actual files in the database. They are links to the actual file, which is stored elsewhere on the hard drive. If the root filename has been changed, then the file in the database has lost its path. If you change the root file name, then you will need to re-add that file to your database.
When song is playing, there is no sound: this is probably due to your volume control settings. You should check all of your volume settings to make sure none of them are muted. Go to Programs/Accessories/Multimedia/Volume Control.
If the settings are not muted, there is probably a problem with your Recording Gain Control (found under Programs/Accessories/Multimedia/volume control, options, properties, recording) setting. Some systems will default to having the "Line-in," checked, which is incorrect. What needs to be checked is the "CD" or "Mix-All". You will then need to re-record the song.
When song is selected for play, the database cannot find it: Usually this is due to a broken path, caused by renaming or deleting the root file. (Files in the Database are just links to the actual file, stored elsewhere in the PC.) You may always change your database names by just overwriting them.
How to change the MP3 registration: there are two ways to change your mp3 file player registration. You can either reinstall the player of your choice, or you can do the following:
1. open Windows Explore.
2. click on the view menu, then options.
3. Then click on the tab "File Types". A list of registered file types will be shown.
4. Go down the list and click on the MP3 file type. It should show a MusicMatch logo.
5. You can either remove it, or edit it to use a different player.
6. To remove it, just click on the "Remove button".
7. To edit it, click on the Edit button. Then click on the "open" in the text box, and click "Edit". Type in your player, or use the Browse button to select you favorite player.