do you have a virus? do a scan to find out before you do anything. simple things first... did you restart your pc all together, maybe it was just a non responsive thing. also, if you need to, you can restore your pc to a previous date without losing all your personal stuff (email, files, music etc...) Go to Start, Programs, Accessories, System Tools, System Restore (on Win XP) then follow the instructions. Pick the closest date BEFORE your media player was missing. In the restore points(calander page) it will tell you why it created the restore point to begin with. Please feel free to message me if I can help you out anymore.