I guess I should have looked around before I posted this..
Direct from act labs website...
Q: I connect my PC USB Gun, but nothing happens. Windows doesn't detect it.
A: Try a different USB Port on your computer. Remember that the USB Gun will only work on Windows 98 Second Edition, Windows ME, Windows 2000 and Windows XP. Older versions of Windows are not supported. Also make sure that your USB ports are not disabled in your system BIOS. Finally, make sure you have the latest version of DirectX installed on your system.