PWJT8D

Most people like myself just live with the distortion. I have not tried the fix mentioned above bye BIGSKY. However for the 2D popups causing the flickering mouse, single digit frame rates and sim crashes can be fixed. Navigate to your SimObjects>Airplanes folder and in each aircraft folder find the panel folder and open up the panel.cfg. You'll find a list of all the windows for that aircraft listed as [Window00] and [Window01] and so on. In each window look for where it says size_mm=1280,960 for example. Under that line you need to add  pixel_size=1280,960. So what ever numbers it has listed under size_mm=, use those same numbers in an added line under pixel_size=
 
 
Here are two example windows taken from my Coolsky DC-9 panel.cfg and the added changes are in bold.
 
[Window01]
file=CSDC9 - Overhead Lower.bmp
size_mm=1280,960
pixel_size=1280,960
window_size_ratio=1.000
position=0
visible=0
ident=10090
zorder=29
 
[Window02]
file=CSDC9 - Overhead Upper.bmp
size_mm=1280,731
pixel_size=1280,731
window_size_ratio=1.000
position=0
visible=0
ident=10100
zorder=30
 

I don't know your level of knowledge with computer hardware installations, especially with a GPU swap so correct me if I'm wrong but I want to make sure you have done these few things.
 
As per NVIDIA's instructions to install a new GPU, you should first uninstall your current GPU drivers. Once that is done, and obviously your screen resolution is now wacky, shut down your computer. Once the computer is shut down, remove your old GPU and install your new one. Start the computer up and install NVIDIA's latest drivers. This should clear everything your computer had remembered about your old GPU and start fresh with your new one.
 
Then you should navigate to x:\Users\UserName\AppData\Local\Lockheed Martin\Prepar3D v2\Shaders and delete the files in this folder and new ones will be compiled the next time you start P3D.