Hello Jan! Thank you for your question. I am a licensed computer professional with over ten years of experience, and I will be assisting you today.I'm sorry about the issue. What's the model of your windows 8 pc? If you do not have any data, such as documents, pictures, etc., on the windows 8 pc, then you don't have to clear.If you want to clear, please try:
Swipe in from the right edge of the screen, tap Settings, and then tap Change PC settings.(If you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, click Settings, and then click Change PC settings.)
Tap or click Update and recovery, and then tap or click Recovery.
Under Remove everything and reinstall Windows, tap or click Get started.
Follow the instructions on the screen.
Another way to clear:
Note: you do not need to clear if the computer is not set up yet, or if you do not have any data/file on it.
Please click on the Reply to Expert tab below, and reply back to me, so I can help further if there is still any issue. Thank you,