Dvd/cdrw read problem



when i restart my system, the dvd/cdrw is reading cds just fine.. but later on, it doesnt seem to read anymore... when i right click on the drive icon, it said file system Raw... it plays music cds fine, but it doesnt load up my winamp to play. i need to open winamp and play it there by choosing a drive to open the music cd..

so my problem here is that my cds i put in later on doesnt read.. can anyone help me? am running win2k
this started happening after i installed xp, it also had the same problem in xp. so i switched to 2k and its still happening..

pioneer 116
yamaha 2200e