Buffalo provides Data Recovery services. Read about it here.
The drive should show up in window's disk management utility as 'unknown partition' (You can get there by going to start>right-click on 'my computer'>manage>disk management)
Right click on the area directly to the right of the Disk (the usb drive should show up as disk 1 or disk 2), and you'll see the option to format.
Format it to NTFS, and you're good to go.