{SOLVED}
1. CTRL+Alt+Del
2. Click on Task Manager
3. Click on more details(at the bottom)
4. Scroll down to background
5. Look for Nexon Launcher
6. Right click it and click on "End Process"
7. ONLY click it ONCE and then Wait for a couple of seconds
If there is more then one it will delete all of it on its own. You don't want to accidently End the Process of something important
8. After that is done make sure that you CLOSE OUT of Task Manager BEFORE you open Nexon Launcher again. OTHERWISE it will make your computer run SLOW
And....THAT'S IT! ENJOY!!!
I found this out about 20min after I ran into the same problem when I tried to launch it after JUST downloading it the day before(I was catching up on a show first)
Of course, I was given a hint while looking at a 2015 report on the same issue and a guy said to just click on Task Manager....
I don't think the victim on the same issue even now EVER got what he meant.
Poor guy.....