MyBook disk doesn't work via Firewire

Hi,
I have a 1TB MyBook from Western Digital. When I connect it via Firewire 800 to my MBP in Windows 7 (Bootcamp) it is recognised but when I start copying (read or write) it just hangs after a while or becomes very slow. If I connect it via USB it works. Do I need some drivers ? If yes, where can I found them ?

I found this on WD but I have the previous generation i.e. without the digital screen. If I go to the software download, it says that the drivers won't work with the previous gen ...

 

please help, this is annoying.

I also realized that in My Computer, the icons are missing.