I am the person that will be helping you today.
May I ask how long it stays connected before it disconnects? While it is connected, are you able to access the Internet?
I will be standing by, looking forward to your response.
Thank you for the update.
How about this; can you plug the problem wireless computer into the router or modem with a cable and allow me to run a secure remote assistance session on the computer so I can setup the wireless connection?