Fairy Godmother,
Start, control panel, network and sharing center. Click on your connection, click on properties. Look for TCP/IPv4 and TCP/IPv6 and click on properties for each. Have your settings match mine.
Power off your ISP modem/router and your wireless router(if any) for 30 seconds. Then power on the ISP modem/router. Wait 15 seconds, then power on the wireless router(if any)
Restart the computer and try to connect.
What happens?
Rick