Use Shared Windows Internet Connection

The wireless on my Mac box doesn't work. Long story...

So, what I've been doing is hooking my router's internet up to the Mac via USB ethernet. This works well, but now I'm moving the Mac away from the router in to another room.

So, I need some kind of wireless connection. My idea was to use my PC laptop as an internet connection. With windows, when you hook one computer up to another via ethernet, you can use the internet connection from the other machine.

Is it possible to do this with Mac/Windows? In other words, I hooked my Mac up to my PC laptop via ethernet, and I want the Mac to grab the PC's internet connection.