How do you know that it copy it fine? I think you only could see this when you insert it somewhere??
Maybe there are some grouppolices witch prevent you from copying anything on USB-Drives!?
I also would recoment to use windows 10 instead of Vista maybee it detects all your hardware automaticaly and you dont have to search.
Otherwise you could get the vendor and device ID of the NIC and search whit them.