First: Sorry deerpark for interrupting I hope you don't mind.
When I select my network it doesn't even ask me for the Key and it automatically say : Windows cannot connect to Network.
This is because Vista saves The WEP of a network witch you already entered.
You can change this by going to the properties of that network and click most right tap there you will have a WEP key. you can enable that you can read what it saved. could be a good control.
By access point i meant the thing that creates the wireless network. Basically a box with antennas on somewhere in your house.
Could be a router to.
The difference is that a router has Ethernet out to so you can connect true cable.
Please look at the thing whatever it is and tell us what make and model it is.
Hope this cleared up a bit.
Jonas