How to restore Windows to an earlier state using System Restore in Windows 8.1 and Windows 10
Start System Restore. Right click the Start button and select System.
In the next window click System protection on the left.
In the next window click System Restore... button on the right.
On the first screen simply click Next.
Select the desired restore point from the list. If you do not see one that suits your needs, you can check the option Show more restore points.
After you have selected the desired restore point click Next.
On the next screen you will be presented with some information about the process. We recommend that you read the information carefully, especially if this is the first time you are using the System Restore feature.
When you are ready, click Finish.
You will be asked if you are certain you want to continue. This is your last chance to cancel the process if you want or need to. If you are indeed certain you wish to proceed, simply click Yes.
Your computer will reboot, during which process changes will be applied.
After Windows starts up again you will see a window with a short summary. Simply click Close.