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2. Press the F11 key during boot
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If you are unable to get into Windows to start the recovery then you start the process when you first switch on the PC.

As soon as you turn on your PC, tap the F11 key on the keyboard until you get the "Windows is loading files..." message.

When Recovery Manager has loaded click advanced options
Choose system recovery
 

If you wish to try and backup any data then choose backup your files first and follow the on screen instructions
 

To run the recovery without backing up your data choose to recover without back up

The recovery will launch and restore your system back to it's factory default state