Windows to RasPi Internet Connection Sharing

One of the cons of Raspberry Pi is that it comes without a built-in wifi card. If you do not have a wifi dongle that works with Raspberry Pi out of the box, what your are left with is to connect it through a ethernet cable (or compile yourself a driver for your non-compatible wifi dongle, as discussed here). However, for my case, my internet router is located far away from my Raspberry Pi. So the next best thing I can do is to hook it to a laptop using an ethernet cable, and use a shared internet connection.

Here's how to turn it on in Windows 7 and above.

1. Go to Network and Internet, then Network and Sharing Center in Control Panel. Click Change adapter settings on the left panel.
2. Click on the active network you wish to share. A dialog box showing network status will pop up.
3. Click Properties, then select Sharing tab.
   
4. Check Allow other network users to connect through this computer's Internet connection, as shown below.
   
   

5. For Home networking connection, select the name of the network connection between the laptop and Raspberry Pi.

Source:
How to share Wi-Fi in Windows 8 with Internet connection sharing (ICS)