Does MB open when you launch it and the problem occurs only when you attempt to play a file?
- What version of MB are you running? Installed or portable?
- Does the issue occur with -all- music files or just specific ones?
- What format is your music in?
- Try launching MB as administrator.
- Check your security app log to see if that is blocking MB. Avast is notorious for thinking MB is trouble.
- Check the Error Log (Help > Support > View Error Log.) If there are entries around the time of the error, please cut and paste here.