Have you recently upgraded your windows machine from win7- win10 or win8 – win10? Then you may experience slowness and drivers issue this usually occurs while you upgrade your windows machine. For this the best solution is, to do a fresh installation of Windows 10. but this is a bit difficult, we need to take a backup of our data and need to create a fresh installation media(Win10 Flash Drive). In this article, I showed how to reinstall windows 10 without External Recovery Media. Using the Windows advanced recovery environment. Windows 10 is used to diagnose and fix issues with your Windows installation. This includes performing a clean Windows 10 install, too. There are several methods for loading the recovery environment. These methods work even if you don’t have the original Windows 10 installation media you used for your first installation(without External Recovery). With these steps, you can use the recovery partition built-in to Windows 10 to reinstall the operating system.
Perform a Clean Install Using Advanced Recovery Options in Windows 10
The advanced recovery environment is used to resolve problems that might prevent your Windows 10 installation from starting. There are several ways you can boot into it.
Load the Recovery Environment When You Start Your Computer
This is the most common method because it can be used when you can’t boot to the Windows 10 sign-in screen or desktop. Press the power button to start your computer. Immediately when the Windows 10 splash screen appears, power off the system. Repeat this process two more times. Upon the third try, Windows will load into the recovery environment.
Click Advanced options. 
Click Troubleshoot. 
Click Reset this PC. 
Click Fully clean the drive. 
Click Reset. 
The rest of the process is just like performing a new install of Windows 10. 
These options come in handy if you don’t happen to have any physical reinstall media such as a USB or DVD. Remember you can also create a recovery drive in advance since this can be helpful if your system reserve drive is damaged.
