Hi,
Unfortunately, I have never found a solution that uses PC. If its any help at all to you though, the one solution I did find is by transferring your Cubic QTVR images to Mac and using a couple of programs called Cubic Connector and Cubic Converter from Apple. These programs let you number the hotspots and if you want link as nodes/individual images. I have then put these into director and all the test scripts work.
Sorry this isnt easier and I hope this might help.
Simon