"DIAGNOSE PROBLEM POP UP"

Hello, I recently bought a new Dell laptop for my husband. He is having problems getting into his e-mail. When he turns on the computer and tries to pull up his Verizon e-mail, it immediately reads the above caption. People have told me the problem might be our wireless hookup and not the computer itself. Anyone out there ever experience this problem. I am going crazy trying to fix it - I would appreciate all suggestions.