FIRST TIME CONNECTION TO SET UP A ROUTER
1. Connect the computer to the router using the Ethernet cable so that you can access the router set up details. This is done by typing 192.168.n.n (n depends upon the make of router) into a browser address bar window. When asked for the user name and password, type the default values for your router. Go through the sections until you find one where you can enter your ISP details, i.e. the user name and password given to you by your ISP.
2. To set up wireless access, look for a section named wireless or similar wording and find an SSID name and a security key. Make a note of these and/or change the SSID to something more meaningful to you but don‘t use obvious names, like your name. Also, if the key type is set to WEP change it to the more secure WPA.
3. Your router may have a section that allows backup and restore of the router configuration. If so, make a backup to enable you to easily restore the set up in the event of having to reset the router to factory settings.
4. The SSID and key are needed for any wireless computer to connect to a router. The software varies from manufacturer to manufacturer but it involves keying in the SSID and the security key. Right-click the wireless network adapter’s icon in the system tray, open it and follow the prompts to connect.
Check your router by trying the Internet Connectivity Evaluation tool here http://www.microsoft.com/windows/usi...d/default.mspx
EDIT. I forgot to answer your other questions:
I don’t use a third-party firewall just the Windows one and the router’s one.
Don’t disable your anti-virus.
Get the wireless working first then post back here if you can't share files.