This is a useful protective feature by Google to that can help keep your password safe from keyloggers (tools that monitor key presses to determine what the user was typing). Unfortunately, it only works if you have a phone with a QR code scanner.
Steps:
- Go to https://accounts.google.com/sesame
- Scan the QR code that is presented to you.
- Open the provided link on your phone browser and login to your Google Account.
- Confirm that your really want to give the computer access to you account
- Once you confirm, the page with the QR code on the computer's browser will automatically reload into your account.