I think the best thing to try is to uninstall everything related to the Kinect to avoid any mix of libraries and 32/64-bit, and then start installing again using the links on
the Greenfoot Kinect instructions page.
So, go to Control Panel->Programs and Features, and uninstall the following items, then install everything again:
- OpenNI 1.x.x.x for Windows
- PrimeSense - NITE 1.x.x.x for Windows
- PrimeSense Sensor KinectMod 5.x.x.x for Windows
- Greenfoot Kinect Server