haydee

Hi everyone

I bought a Gateway notebook with the though of using it in different
areas of my apartment. We have a computer in a bedroom using Comcast cable high speed connection and it has a wireless-G router connected.
The laptop comes with built-in wireless connectivity but I don't get connected to the Internet not even having the wireless-G router on
the other computer. It gives me though an unsecure connection available which of course I'm not going to use. It also gives me a
network connection done with other laptop but we forgot the security
paraphrase.
Why the supposed built-in wireless connectivity doesn't work?
Why it doesn't get the signal from the main computer with the wireless router?
What do I need to get to make it get connected anywhere in the apartment?

Thank you very much for your help in advance.
haydee