If you hold down the Shift key when you log on to Windows, the programs in the Startup folder will not run automatically. The same applies when you insert a CD/DVD or USB flash drive. If you hold down the Shift key, the AutoRun task will not be executed on the drive.
If a window moves off your screen or is no longer accessible due to another error, hold down the Shift key and right-click the taskbar icon of the missing window. A new context menu will appear. Choose Move. Then press the arrow keys to move the window back into the visible area of the screen. Try different arrow keys if you're not sure which direction the window disappeared.
If you want to use the system repair options and Windows 10 is still booting and allowing you to log on, click the Windows logo in the lower left corner of the taskbar and then hold down the Shift key while clicking the power button directly above it. Continue to hold down the Shift key and click Restart. This will open the troubleshooting screen with system repair options.