GUI Started Running Very Slow (Tested on 2 Different Unity Versions + Reinstall)

So I'm creating a GUI Window, but the elements started to take a long time to redraw. I figured it was an issue with the script as I was trying to fix errors with Stack Overflows.

But then i noticed the x button for closing the window was also slow. Takes about 5 seconds to change to the mouse over image when I mouse over. After testing, I've found that the same happens on all unity windows such as the hierarchy.

Then I found it happens in any project! Including when I changed to a different version of unity (5.6.1f1 and 5.51f1). Reinstall of unity and restarting my computer has not fixed the issue.

I'm assuming this is an issue with my computer? But literally everything else runs fine. Even the elements inside default unity windows such as the hierarchy. Also it doesn't appear to happen when in play mode.

 

I've tried a system restore point before this issue arose but no luck, my last option at this point is a full reinstall of the os which i'm hesitant to do at this point.