As long as you have made plans to keep a copy of your current driver and configuration, JIC, then I can see no reason why you couldn't try with the latest version from the nVidia web site. But remember, that is just my opinion - I do not use that driver/controller combination myself.
Only the persons responsible for software development/support for the Google Earth package would be able to answer your second question.
"I have no idea" is my honest answer to question #3, whilst I'll answer #4 with a "I don't know".
Unless anyone else has a view on this subject, it does seem that you are on your own. Sorry if it is not quite what you would like to hear.