Sometimes after using your computer for a while it begins to  slow down and act funny. Windows 7 8 and 10 have built in a way to refresh your system witouth losing any of your files or settings. If you upgraded from a  previous version of Windows this option may not be built in to your system. There IS another way to refresh your system.

You can create a usb drive that will help you refresh your system. the website for this is https://support.microsoft.com/en-us/help/15088/windows-create-installation-media

​