Go to the command prompt (hit the button on the keyboard that opens the start menu and hit R at the same time) and type MSCONFIG and hit enter. Just select diagnostic mode and hit OK, it will prompt you the restart. When you restart, almost nothing will work because there's only like 2-3 services running. No internet, no sound, etc, but you won't need those to run Wprime and get your screenshot. After you get your screenshot saved, go into the command prompt with MSCONFIG again, and just select the normal startup, and then restart.