Help - Network usb adapter connection to router problem

I have a Verizon router and I purchased a NetGear N900 wireless dual band usb adapter for my son's computer. I was going to test the N900. It is for college.

The N900 will not connect. I do have three other laptops that do connect and work ok. The N900 has WPS but the Verizon router does not.

So I have to use the SSID, 'wep' option, and the wep key. The N900 tries to connect and stops trying after about 20 seconds or so. The N900 varies from 4 to 5 green bars. Any ideas on what might be wrong?

N900 installation was followed and went smoothly and the new software version was used. We are using Windows 7 Home Premium 32bit on my son's computer.

I also purchased the Western Digital My Net N750 router for college. I have no way to test everything at home. It does have WPS so at the college I hope everything works.

Thanks very much!