Third-party applications will not be reinstalled when you revert, so you will have to install them again.
How Do I Revert to Windows 10?
Open theSettingsmenu and scroll down until you see theRecoverybar on the right.

Once theRecoverymenu opens, you will be given a list ofSystem Settingsto choose from.
Locate and selectGo BackunderRecoveryto revert the operating system back to Windows 10.
Go back to theSettingsmenu and return to theRecoverysection.

LocateAdvanced Startupwhich is below theGo Backbutton and selectRestartNow.
A notice will appear telling you to stash your work.
Do so if you havent already.

Its recommended you back up your data as well.
SelectRestart Nowonce youre done.
For this guide,Use a Devicewill be chosen.

You will be given the choice of which method you want to use to install your new operating system.
In this example,CD-ROM Drivewas selected to drop in the new operating system.
The computer will take a few seconds to reboot.

Once it does, follow the on-screen prompts of your new OS to complete the installation.
How Do I Reinstall Windows 10?
Since your rig won’t work without an operating system, you will likely want toreinstall Windows 10.

Right-hit the program or app and clickUninstall.
bring up the Start menu and navigate toSettings>Update & Security, then selectView Update History.
ClickUninstall Updates, then find the update you want to uninstall.

Right-tap the update and selectUninstall.
To uninstall Avast Free Antivirus,download the Avast uninstall utilityand save it to your PC.
Right-hit the setup file and selectRun as Administrator, then follow the prompts to restart into Safe Mode.
When restarted, navigate to your Avast program files, then selectAvast Free Antivirus>Uninstall.
Wait for the process to finish, then reboot your system.