You should have no problems installing in Windows 8. Please make sure you are using the latest installer, here is a link to our most up to date installer for build 389, http://www.pangolin.com/_Files/Setup_QS2.exe. If you still have a problem, please email me (at my screen name) with a screen shot of the error you are seeing.
I had the same problem in Windows 8. For me the solution was to download the FB3 drivers directly from the pangolin website (instead of using the ones on the dvd)
You should not need to download the drivers from the web site (the ones on the website are the same ones on the DVD) but you may need to manually update them in the device manager as Windows likes to install the incorrect one based on your OS bit level (32 or 64).