Let me help you from here, SunshineBe77829.

You can delete those folders. Once you QuickBooks is installed, new folders will be created for the installation.

You may not need to uninstall and reinstall the program. You'll just have to restore the backup. You can follow the steps provided by ShiellaGraceA at the top. Or, just open the link I've provided. 

If you have more questions, please feel free to get back to this thread.