Computer not reading MyPassport

WD External Drives WD Portable Drives
5

I was the same prob with my passport essential(320gb)and i found this solution from win7 and from computers with 

NVIDIA USB EHCI chipset and at least 4GB of RAM.For more details read bellow:

http://community.wdc.com/t5/My-Passport-for-PC/Drive-not-recognized-Win-7-32-Bit-RC1/td-p/8065