MP3 Problem

I have a Sansa model c150 2 gig MP3 player, I recently added new songs to it, when removing the USB cable from the PC (a P4 running windows Xp) forgot to use the safely remove hardware utility.  Now I am unable to add, remove view any songs or files when I reconnect the player to the PC.   On any other PC it works fine and all songs are shown.  Any suggestions?

I have exactly the same problem… someone please reply!!!

ohhh except my mp3 is a sansa c240 1GB…