One way to get your PC back to how it was before something went wrong is System Restore. This replaces your current settings with a copy which the computer had made in the past.
Click on the “Start” button
Type “restore” into the search at the bottom corner, and select “System Restore” from the list of items.
Next you’ll get a list of “Restore Points”, choose one that is dated before your problem and follow the on screen instructions.
Your computer will restart with the restored settings. It takes a few minutes.
Now have a look and see if its fixed your problem.
If your problem was caused by some malicious software you’ll need to scan with your antivirus and Windows Defender to ensure your problem doesn’t return.