If your Windows 10 computer is working, it may be time to set. If it's a new purchase, you may only need to clean junkware using Microsoft's Windows Update Utility.
However, if you do not think your computer is running as well as it should be or if you get disturbing error messages, it may be time to restore your computer to its factory settings. If you choose the nuclear option, be sure to back up your files before the major reset so you do not lose anything. Then follow the instructions below to (hopefully) make it run smoothly again.