I finally fixed it. Still have no answers as to what caused it, but, its fixed.
I have a Gateway laptop (running Windows Vista) and 2 others running of my wireless router. Every now and then my husband hit F2 and shuts off the wireless on the Gateway, so I just hit it again to turn it back on then my router asks for my passphrase and thats that. BUT this time instead of asking for my passphrase I get a window I've never seen before that says "Enter Credentials" and it wants a username password and logon domain. I've tried everything! I can send a pic of the window if needed. Please. any help would be great.