Please save my GCE-8523B LG CD-Writer!

Hi buddies, i got a GCE-8523B LG CD-Writer (working well on windowxp), then i plug it in a win2k pc, install nero burning but i can READ CD only COULDN’T write! To make it worse, i (don’t know why) install somethin’ called GCE-8523B104(w) (firmware upgrade), then my CD DISAPPEAR!! my PC couldnot see it even in DOS!! I’ve tried to uninstall ev’rythin’ in IDE/ ATA/ATAPI controller then restart PC but it does not help!!
Any one can help me recover my CD drive? i need it badly…
thanx a tons.