This may be relevant, if not I apologize profusely. I had this exact issue, different hardware. Worked with this issue for days, reading everything I could find. In the end I uninstalled the driver. But I used a third party uninstaller, one that removed all traces. Went through and deleted everything Nvidia. Ran the installer again and chose clean install and it installed just fine. When using the "stock" uninstallers there are a lot of registry entries left over. I can only assume that there was something left that interfered with the install.
Dusty