Brand New HD My Book 2 T Not working

My PC do not recognize my new HD (WDBACWOO20HBK-00) 2TB My Book Essential.Install software 1.4.5.2 it still does not appear in the work area.I tried installing on my laptop (WindowsVista) was not recognized
by windows vista …
Only appears as a hidden icon. How to solve this?

Thank you

You will need to install the ses device driver here is the link

http://wdc.custhelp.com/app/answers/detail/a_id/5419/session/L3RpbWUvMTMwMjU0OTg3NC9zaWQvRGZDdG1lcms%3D

Ok the drive is not recognized on Computer, try going to Disk Management (Start > right click on Computer > Manage > on the computer management window click on Disk Management) if you dont see your drive there, you can try it on another pc to really determine the drive is defective or not, is the drive is not recognized on another computer then, contact WD for a replacement