Maryfi is a free and easy to use software router for Windows 7 computers. Using Maryfi, users can wirelessly share any Internet connection: a cable modem, a cellular card, or even another Wi-Fi network.
Other Wi-Fi enabled devices including laptops, smart phones, music players, and gaming systems can see and join your Maryfi hotspot just like any other Wi-Fi access point and are kept safe and secure by password-protected WPA2 Encryption.
Before You Install Maryfi
Step 1: Download Maryfi on your Windows 7 computer from here
Step 2: Connect to your computer to home network.
Step 3: Apply sharing settings to your home network and enter the same Wi-Fi name and password.
Step 4: Now hit “Start Hotspot.”
You can finally have Internet access in that impossible back room or basement.Wifi devices will now automatically connect to the Internet through either your Maryfi hotspot or home router depending on proximity.
See the Video Tutorial Below for more details