Restore Windows
If you feel Windows isn't performing as well as it once did, and you don't know why, you
can restore Windows to its initial status.
Step 1. Click Start ➙ All apps ➙ Settings ➙ Update & security.
Step 2. Click Recovery.
Step 3. Under Reset this PC, click Get started.
Step 4. If you want to keep personal files, select Keep my files. If you have backed up
your personal files, click Remove everything.