This have been a known issue with Gemini Hitech products. Even their own website do not provide downloads for the drivers for their products. I think that is really sad.
I have a friend who tried contacting Gemini in the past through the contact information provided on their website and he never got a reply back. Seems like Gemini customer or help desk support is hopeless.
Though I ran across this driver provided by Driver Guide which will work with Gemini Hitech USB web cameras. This is only available to its members BUT you can sign up for a free account with driver guide if you want to give this a try. The file is called lc100.zip
Hope this helps. Good luck!