Generally, you dont need any third party software at all to connect to a wireless router.
Its usually all gumph anyway,
just power the router, open explorer or firefox or whatever, type the IP address of the router,(usually 192.168.1.1, it will come with the router instructions)
Then the router/modem password and username, (usually Admin, and Admin, again, will come in the router instructions)
Then when access to the router settings is gained, you just need to enter your ISP username and password and away you go.
As long as you have got a wireless card in your pc it should see it and connect.
When you have access to the router settings there is a place where you can set up your WEP access code, usually under the security tab.
If the router has been factory shipped with this it will again, come with the router instructions. Otherwise you can set up your own here. (usually a ten digit code for the lowest protection.)
you then need to enter this code into your wireless connection on your PC.
There it is in a nutshell.