For Windows 7, repeatedly press the 'F8' button after powering on your PC. Choose 'Safe Mode with Command Prompt' from the Boot Menu Options. Next, type "cd restore" and then "rstrui.exe" without quotes. This process will launch the System Restore application. For Windows 8, 8.1, and 10, press the 'F11' key at boot to access the 'System Recovery' menu, which brings up the Advanced Options screen. Select 'System Restore' to launch the process.