Firstly, Right click the windows icon on the Bottom left of the screen, this will bring up a menu. Click Control Panel.
In Control Panel search (In the top right corner) System Restore, then select the first option under System marked Create a restore point.
When opened you’ll have a box that says System Restore…, Click it and it will start the System Restore Wizard,
Press Next and you’ll be taken to the page displaying the different Restore points you have available. Click the one you’d like to go back to and then click next.
On the next screen you can just click Finish, you then need to leave your computer to do the restoration.