If your computer does not have a compatible card, you may want to get one of the following cards that are known to work with Connectify Hotspot:

Intellinet Wireless-N USB Adapter - 523974

D-Link DWL-G510 Wireless PCI Adapter, 802.11g, 54 Mbps

Airlink 300n Wireless-n & G PCI Adapter for Desktops Model Awlh6090 PCI Network Card

Rosewill RNX-N1 Wireless-N 2.0 Dongle 02.11b/g/n USB2.0