Update: someone suggested ruling out the graphics card by plugging it into another screen. I plugged it into TV and it looks great again!
When I try and install Splendid again, it says "There is a program with this Windows installer package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor"
Again, any insight would be fantastic!
Update Update:
I talked to someone at ASUS who recommended I restore to the last Windows system update (before I uninstalled Splendid) and that has since fixed the issue. Whether it is because of Splendid being re-installed or removing the last update I am not sure!!