This error is caused by the operating system malfunctioning. Major parts of its structure are affected, and because of that Revo Uninstaller will have a hard time starting. The first thing to do is to reinstall the application, but in case if that doesn't work as expected, I recommend to perform a Refresh (Windows 8.1 and Windows 10 - option found in Windows + X> PC Settings > Update and Recovery) or completely reinstall the operating system.
Download the application again: http://revo-uninstaller.software.informer.com/