I/O Magic USB Enclousre for 3.5 hard drive

Hello,
i have a external hard drive fr my comp it was orignaly for my xp comp.( idont have any more) but now i want tuse it on my visa comp...shockingly it regconize it but one problem i can't ind in the removeable hard ware part like c drive d drive e drive f drive u know that area so i went into it more and it said this CL\windows\system32\divers\USBTOR.sys


what does that mean i want to use my device but cant figure out how to get it to work...i have windows vista 32 bit service pack 2