Click the Windows start button in the lower left corner of your screen

Click the gear icon to open the settings window

Click the "Update & Security" tab

Click on the "Windows Security" tab

Click the "Open Windows Security Button"

Click the "Virus & Threat Protection" tab

Click "Scan Options"

Select the "Full Scan" radio button. Scroll down and click "Scan Now" to begin the scan

You can minimize this window and let the scan run in the background. Don't turn off your computer while the scan is running. You should receive a notification when the scan is complete. You can navigate back to the menu in step 6 to see the date of the most recent scan