I had just loaded a clean install of Windows 8 Professional. I installed google earth and it was in 3D. This was new and I've never seen this before. Reading online it was because the Stereoscopic 3D was enabled, but there wasn't a section in the nvidia control panel. Here is how I fixed it.
First I downloaded these drivers. Link
The card that I had in that machine was the Nvidia Quadro NVS 295.
After downloading the file, I chose custom install. Here is where I noticed something was missing.
Notice in the picture below that the two 3D options are unchecked. Previously the current version beside those were "Not Installed". I selected all options and told it to a Perform a clean install.
After two reboots everything seemed back to normal and opened up the Nvidia control panel now and here is what I saw.
I now have the option to turn Stereoscopic 3D on and off. By default I it was turned off. I loaded up google earth and now it was back to 2D.
OS: Windows 8.1