How can I share my 3G dongle internet connection wirelessly via my laptop?

[Insan]

I have a 3G USB dongle with the Three network and I use it to get internet on my laptop via the 3G network. My question is, can I turn my laptop into a wi-fi hotspot and share this 3G internet connection, and how? The laptop is running Windows 7 64-bit, and yes it does have a wi-fi card built in.

I know I can do it with a cabled ethernet connection, because I have done it before on my other laptop. And I know there is a program called Connectify which you can use to share your internet connection. But I tried using Connectify yesterday to turn my laptop into a wi-fi hotspot and I tried changing some network settings to enable the 3G connection to be shared, but it didn't work. So I wondered if someone who has done it before, or knows how to do it can take me through exactly what settings I need changing.

Thank you.