I am sorry to hear about that problem. My name is***** am a computer expert with 17 years of experience and I will be trying to help you as good as I can.
Do you have the possibility to setup the Windows Vista computer with a ethernet cable, so that you can directly connect it to your router? Because if so, I would recommend that we then do a remote-assistance directly at your Vista computer and I will try to setup the WIFI connection for you there.
Please reply at the box below (there are no additional costs associated with this, you can reply as often as you wish).
Thanks for your patience and best regards,
(Note: Changed to Answer per CS)