I faced exactly the same problem last week. I installed OpenKinect
drivers first and then tried to install PrimeSense driver.
I eventually figured out that you can install & have both drivers in
the system. To install SensorKinect after OpenKinect you'll need to do
it manually: i.e. Update Driver ->Browse My Computer -> Let me pick ->
Have Disk -> Point to the .inf file, then the driver will be
installed. Subsequently you can easily switch the driver to use by
going to Update Driver->Browse My computer -> Let me pick (then both
drivers will be listed there for you to choose from). Any time you
want to switch the back-end you can switch the drivers that way.
Cheers
Hai Pham.