There are two main reasons why you might need to recover your computer. Firstly, it might have stopped working properly: it could be behaving erratically after you’ve installed a program or update, or you might not be able to start Windows at all.

The second reason is that your computer feels bogged down, sluggish and in need of a complete overhaul (let’s face it, we all know that feeling). You can remember how efficiently it used to run when you bought it, and you fancy getting it back to its original, pristine condition. Whichever camp you fall into, this step-by-step guide has the answers. Read it carefully, making sure you pick the right options, and follow the part of the guide that applies to you.�

Important note: Please make sure you’ve backed up all your files first – and that means emails and photos, as well as documents.

 

Reset your PC

Resetting lets you choose whether to keep your files or remove them, and then reinstalls Windows. To get started, go to Settings > Update & security > Reset this PC > Get started and choose an option.

NOTE: If you can't open Settings, you can get to reset by restarting your PC from the sign-in screen. Press the Windows logo key +L to get to the sign-in screen, then hold the Shift key down while you select Power > Restart in the lower-right corner of the screen. After your PC restarts, select Troubleshoot > Reset this PC.

If you can't get to the sign-in screen, use/create recovery drive to reset your PC (instruction can be found below).
 

Recovery drive

A Recovery Drive lets you boot your system and easily access a number of recovery and troubleshooting tools to revive a failing Windows system. If you haven't done so yet, you need to create a Windows Recovery Drive. That way, you'll be prepared should you encounter a problem with your Windows installation.

If you did not created recovery drive and Windows won’t start  you have option to create installation media directly on the Microsoft website. Please follow below link to create installation media: www.microsoft.com/software-download/windows10 

Creating a recovery drive
 
1. On a working PC, go to the www.microsoft.com/en-us/software-download/windows10
2. Download the media creation tool and then run it.
3. Select Create installation media for another PC .
4. Choose a language, edition, and architecture (64-bit or 32-bit).
5. Follow the steps to create installation media, and then select Finish .
6. Connect the installation media you created to your non-functional PC, and then turn it on.
7. On the initial setup screen, enter your language and other preferences, and then select Next . If you're not seeing the setup screen, your PC might not be set up to boot from a drive. Check your PC manufacturer's website for info on how to change your PC's boot order, and then try again.
8. Select Install now .
9. On the Enter the product key to activate Windows page, enter a product key if you have one. If you upgraded to Windows 10 for free or bought and activated Windows 10 from the Windows Store, select Skip and Windows will automatically activate later.
10. On the License terms page, select I accept the license terms (if you agree to them), then select Next .
11. On the Which type of installation do you want? page, select Custom .
12. On the Where do you want to install Windows? page, select a partition, select a formatting option (if necessary), and then follow the instructions.
13. When you've finished formatting, select Next .
14. Follow the rest of the setup instructions to finish installing Windows 10.