Can't log on to internet with new computer.

Hello,

I am able to log on the internet with my mac, but just borrowed a hp laptop from a friend and it will not connect. The internal connector doesn't seem to work, so I took a Belkin external and hooked it up to the usb. Neither will pick up the wireless. It shows it available on the external but when i put in the password it keeps wanting me to re-enter it and doesn't connect. If I try it often enough it will show up a screen that asks for a user name and password and domain - don't have any of that! I'm at a loss!! The belkin is old, but I did update the software before using.