This is where Connectify comes in handy. This software allows you to create a wireless hotspot or access point using any WiFi card or dongle without any complicated instructions. Just enter a WiFi name, choose the Internet connection to share and you're done.
There's a free and Pro version of the software. With the free version, your WiFi name must start with Connectify while for the Pro version you can choose any SSID you want. The Pro version also comes with several more features like 3G Internet sharing and drag and drop file transfer.
Connectify Hotspot is available for download at their website.