I can play my music files on my laptop. However, when I try to burn them, Windows Media Player converts the files, then quickly seems to burn them onto a blank disc. When I put them in my stereo they all show one track on them and even that has no sound on it...so basically there's nothing on the disc! What could be the problem???

Is this a new problem? Were things working OK previously? Any new hardware or software?

If this is a new problem try a System Restore to a point prior to the problem:

start > All Programs > Accessories > System Tools > System Restore