I'm not very familiar with music players and I don't know which of these you have tried but here is a selection of Vista repair alternatives, all with links :

1. Run Chkdsk. This may fix errors on your computer http://www.vistax64.com/tutorials/67612-checkdisk.html
2. Run System Restore from a date before you started having problems. http://www.vistax64.com/tutorials/76905-system-restore-how.html?ltr=S
3. Run the System File Checker. This can repair many corrupted system files. It will also identify in the log file any corrupt files it could not repair http://www.vistax64.com/tutorials/66978-system-files.html
4. Copy system files from your Vista DVD that SFC (3 above) identified as corrupt and that it could not repair. http://www.vistax64.com/tutorials/86959-access-vista-install-dvd-files.html
5. Run a Vista startup repair. This can repair more than just the startup process. http://www.vistax64.com/tutorials/91467-startup-repair.html
6. Do a Vista upgrade repair reinstall. This gives you a new OS without disturbing settings, files, folders, other programs, etc. http://www.vistax64.com/tutorials/88236-repair-install-vista.html