Issue Installing

I've installed Davinic Resolve 15 about two times before, uninstalling it for random reasons here and there. This is my third time reinstalling it but it's proving difficult. Everytime I start the installation wizard I am giving the error of "Error writing to file: C:\ProgramData\Blackmagic Design\DaVinci Resolve\Support\Onboarding\DaVinci Resolve Welcome.exe Verify that you have access to this directory."
I've looked up how to solve this but nothing has worked, I've messed with the security to allow full control of the Blackmagic Design folders, reinstalled Windows installer and everything but it just doesn't work? Am I screwed? Do I have to find a new editor? I've attempted installing DaVinci Resolve 14 to see if it get fixed but it says the same thing.
I've looked up how to solve this but nothing has worked, I've messed with the security to allow full control of the Blackmagic Design folders, reinstalled Windows installer and everything but it just doesn't work? Am I screwed? Do I have to find a new editor? I've attempted installing DaVinci Resolve 14 to see if it get fixed but it says the same thing.