Can I use a USB based pfsense that would detect my wireless card?
You are planning to run this on bare metal or in a Virtual Machine?
I tried downloading the pfSense-2.0-RELEASE-4g-i386-nanobsd_vga.img.gz and copied the pfSense-2.0.1-RELEASE-1g-i386-nanobsd_vga.img to a flash drive but my machine would not boot with it.
How did you copy it to the flash drive? Can you provide more detail than "my machine would not boot with it"?
Do you want the machine to act as a wireless Access Point or to connect to a wireless Access Point? The Intel card you have doesn't appear to be supported and I suspect you will save yourself a lot of time messing around with the windows drivers if you bought a supported $15 USB WiFi NIC, but I would need to know more about how you want to use it before I'm prepared to suggest one.