Cannot connect to airport express wirelessly

I see the SSID on my WD live/plus.  I put in my passport and it immediately says network security password invalid.  I have tried it on linksys wireless router with the same result.

My wireless USB adapter is buffalo nfinite n ultra-compact

It works fine while wired.

All I am trying to do is get out to the internet through my airport express and Wd wirelessly.

Resetting the WD plus to factory defaults and then connecting to wireless worked just fine to apple airport express.