Welcome to the Community.
All available downloads related to the WD Dual-Option Combo External Drive including drivers are available in the following link:
http://support.wdc.com/product/download.asp?groupid=406&lang=en
Unfortunately, there are no drivers available for this device related to Microsoft Windows Vista, Windows 7, or Windows 8. The best bet would be to force installation of Windows XP drivers. However, this may result in erratic behavior.
