Table of Contents
This antivirus is free and available for all versions of Windows starting with Windows XP. It was previously named Windows Defender Antivirus and Windows Defender. As of Windows 8.1, it is installed and enabled by default. 
If using another antivirus program or if required for testing, it may be desired to disable Windows Defender.
Real-time protection = Settings > Update & Security > Windows Security > Virus & threat protection > Manage settings > Real-time protection: Off
Scheduled tasks = Task Scheduler > Task Scheduler (Local) > Task Scheduler Library > Microsoft > Windows > Windows Defender
Select each task and either Disable or Delete them: Windows Defender Cache Maintenance, Windows Defender Cleanup, Windows Defender Scheduled Scan, and Windows Defender Verification. 
Download and extract Debloat Windows 10 scripts.
PS> Invoke-WebRequest -Uri https://github.com/W4RH4WK/Debloat-Windows-10/archive/master.zip -OutFile Debloat-Windows-10.zip PS> Expand-Archive Debloat-Windows-10.zip PS> cd .\Debloat-Windows-10\Debloat-Windows-10-master\scripts\
Allow the PowerShell scripts to be executable.
PS> Set-ExecutionPolicy Unrestricted -Scope CurrentUser PS> ls -Recurse *.ps*1 | Unblock-File
Disable Windows Defender.
UAC ensures that all applications are run as a normal user account with no escalated privileges. When an application tries to run as Administrator, UAC will prompt the user and ask if they want to run with Administrator privileges.  This feature was first introduced in Windows Vista. 
“I already have Windows Defender – why do I need another antimalware tool?” Panda Security Mediacenter. July 15, 2021. Accessed August 18, 2021. https://www.pandasecurity.com/en/mediacenter/tips/defender-antimalware-tool/
“how to cancel windows defender automatic scans?” Windows 10 Help Forums. June 8, 2016. Accessed August 18, 2021. https://www.tenforums.com/antivirus-firewalls-system-security/52486-how-cancel-windows-defender-automatic-scans.html
“User Account Control.” Microsoft Docs. December 3, 2021. Accessed April 7, 2022. https://docs.microsoft.com/en-us/windows/security/identity-protection/user-account-control/user-account-control-overview
“User Account Control.” Fandom Microsoft Wiki. June 13, 2017. Accessed April 7, 2022. https://microsoft.fandom.com/wiki/User_Account_Control