my cd-rw drive is a sony crx-230E and dvd drive is a HL-DT-ST DVD+RW GRA-4120B my problem is for some reason the cdrw drive will read cd's and software discs fine, but will NOT burn anything when using musicmatch, nero, or even windows to burn files, music or anything to a cd. My dvd burner is what i use to burn music and what not with, but the problem is that any time i use the windows cd writer it comes up with an error saying the wizard could not complete the disc burn or something like that, it does that for both drives and like i said my sony cd-rw always comes up with an underrun error on musicmatch. My computer is about a year old and it just started doing this one day... what could be the problem?