Cant copy from usb hard drive to western digital my book world

hi guys, im new on here so please go easy on me! right heres the thing, i bought a 1tb western digital my book world edition yesterday, it plugs into my router and so far (apart from the 1 problem) it seems good, i can copy no end of files from my laptop, upstairs pc and downstairs pc no problem. but i have a load of mp3s (about 150 gigs worth) on a usb 2 external hard drive, when i plug this into any of my computers and try copying to the mybook vista comes up saying discovering files and preparing to copy and the numbers are going up but when it finishes discovering the files the copy window just closes, the only way i can do it is to copy to a pc hdd then to the wd drive.

can anyone help so i can just transfer them straight from the usb drive?

it happens on 3 computers all running vista

cheers

Hi, jamiem1987, and welcome to the forums.

You say this occurs on all computers on your network copying to the same Worldbook HD attached to your router?

What sort of security programs are you using (antivirus, firewall, etc...)