Hello,
I ran Tweaking Pro - Common in safe mode, on Windows 8.1 64-bit (skipping the first repair as tweaking stopped running as it couldn't complete it)
On reboot, File Explorer seems to freeze when you try to open or right click a file
Right-clicking the start button and choosing any of the options won't open (like command prompt & control panel
Task manager won't open (Ctrl+Shift+Esc)