http://tinyurl.com/654kxn
Install this and see if your computer actually has a WiFi Device installed or can see an existing Wireless Connection. If this works then all you should need do is Open the Network Connection Wizard and setup the Wireless network
As for the Drivers they will be on the CD that came with the WiFi Adapter in the computer not the WiFi Device. All that is required with the Modem/Router/Wireless Access Point once it's setup is to enter the Security Code whether that is for SSID, WPA, WPA2 or any of the other Encryption Technologies that are used by the different WiFi Device makers at the computer. They need to be the same as what the Wireless Device has setup.
Some have what they call a PassPhrase others require a Password or SSID Code. Depending on who made the Router here things vary dramatically but if it is working OK all you should need to worry about is at the computer end where you have to enter the required Codes to allow the connection.
If you can not get Net Stumbler to detect any Wireless Networks the most likely cause is because the Wireless Driver is not installed in the computer. This is expected with all Desktops as they don't usually have Wireless so you need to install the WiFi Driver after you install Windows. If this is a Note Book and you have a System Makers Recovery Disc the Wireless Driver & Associated Software should be installed provided you used the correct Recovery Disc for this computer. If you didn't you'll need to log onto the Makers Web Site through the wired connection and download the Wireless Driver for your Model Computer and OS that you are using.
OH make sure that you disconnect the Wired Network Cable before you attempt to setup the Wireless Connection. Windows doesn't work with both and you can not set up one while the other is working.
Col