A while Back I picked up a 400G HD EX

I've had a 400 G portable Hard drive for some time and it worked on XP and Vista, but I upgraded my old Laptop to Windows 7 a while back and now the portable 400G HD is not seen. It's a Western Digital Passport 2209A.
It still is seen on Vista.

I have not been able to fine a driver for W7.

Any ideas