First of all, yep! People are able to use 3ds Max 2010 and the G3D plugins for it, there is no need for 3ds Max 6 anymore, it can just be archived as a historical thing.
As for your errors, are you running 3ds Max 2010 as Administrator? To make sure you are, right click 3ds Max 2010, then click "Run as Administrator". Usually these errors are an indication that the program doesn't have Administrator privileges to access the Program Files (x86) directory.