the DVD problem is usually always related to a codec issue of some kind... uninstall your dvd software / mpeg 2 decoder and try to reinstall it... make sure c:\windows\system32\mswebdvd.dll is in your car... if not copy it from your home computer to your car and run regsvr32.exe mswebdvd.dll....

Is it the same music files on the computer in your car? try to delete the music and copy it again from your house.....

david