Just a quick note to confirm that I too had issues with cursor fx when I first installed win 8.
I noticed that it was not compatible with win 8 so I uninstalled it thinking Stardock would fix sooner or later.
I read the forum article this morning and deleted the old set up file I had previously downloaded.
I used Stardock central to download the latest file and install cursor fx again all works fine.
I did not have to use registry cleaners, just uninstall and reinstall seemed to work for me in desktop mode and the start screen.