I am very fond of watching videos and I am fan of rock band and have very good collection of rock band videos, but all of a sudden the video players stopped working, all my video formats are mpeg-4 (xvid) and some of them are in other formats like 3gp, wmv, .avi and all of them are working except mpeg-4. The error I got every time is xvid codec not working. Can anyone help so that I can fix xvid mpeg-4 (xvid) error? Please suggest.