Please uninstall the drivers for your device and then install FX3 SDK. http://www.cypress.com/documentation/software-and-drivers/ez-usb-fx3-software-development-kit
The SDK will install the CYUSB3 drivers, and the SDK contains C++ and C# based host applications. You can test using one of these (like Control Center/Streamer application). We have aslo provided the source files for these which you can refer to create your own applicaiton.
Do I need to migrate anything over? I tried following the documentation today by matching the VID and PID in the INF and wasn't successful. I think we are using a custom written driver... It's back in 2009 but the way they were compiling this driver was with bat files using build.exe...