Turn on Enhanced Protected Mode: registry value IsolationUserHKCU\Software\Policies\Microsoft\Internet Explorer\Main
- Policy ID
- Advanced_EnableEnhancedProtectedMode
- Scope
- Computer Configuration, User Configuration
- Supported on
- At least Internet Explorer 10.0
- Source
- Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
- Category
- Windows Components › Internet Explorer › Internet Control Panel › Advanced Page
Registry
Isolation
REG_SZUserComputer…\Software\Policies\Microsoft\Internet Explorer\MainHKCU\Software\Policies\Microsoft\Internet Explorer\Main Current key
HKLM\Software\Policies\Microsoft\Internet Explorer\Main
HKLM\Software\Policies\Microsoft\Internet Explorer\Main
- Enabled value
- PMEM
- Disabled value
- PMIL
Apply with .reg · CMD · PowerShell
UserPer-account setting
.reg
Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Main] ; Options (use only one) ; Enabled "Isolation"="PMEM" ; Disabled "Isolation"="PMIL"
CMD
:: Options (use only one) :: Enabled reg add "HKCU\Software\Policies\Microsoft\Internet Explorer\Main" /v "Isolation" /t REG_SZ /d "PMEM" /f :: Disabled reg add "HKCU\Software\Policies\Microsoft\Internet Explorer\Main" /v "Isolation" /t REG_SZ /d "PMIL" /f
PowerShell
# Common: create the key New-Item -Path 'HKCU:\Software\Policies\Microsoft\Internet Explorer\Main' -Force | Out-Null # Options (use only one) # Enabled New-ItemProperty -Path 'HKCU:\Software\Policies\Microsoft\Internet Explorer\Main' -Name 'Isolation' -PropertyType String -Value 'PMEM' -Force | Out-Null # Disabled New-ItemProperty -Path 'HKCU:\Software\Policies\Microsoft\Internet Explorer\Main' -Name 'Isolation' -PropertyType String -Value 'PMIL' -Force | Out-Null
ComputerMachine-wide setting
.reg
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet Explorer\Main] ; Options (use only one) ; Enabled "Isolation"="PMEM" ; Disabled "Isolation"="PMIL"
CMD
:: Options (use only one) :: Enabled reg add "HKLM\Software\Policies\Microsoft\Internet Explorer\Main" /v "Isolation" /t REG_SZ /d "PMEM" /f :: Disabled reg add "HKLM\Software\Policies\Microsoft\Internet Explorer\Main" /v "Isolation" /t REG_SZ /d "PMIL" /f
PowerShell
# Common: create the key New-Item -Path 'HKLM:\Software\Policies\Microsoft\Internet Explorer\Main' -Force | Out-Null # Options (use only one) # Enabled New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Internet Explorer\Main' -Name 'Isolation' -PropertyType String -Value 'PMEM' -Force | Out-Null # Disabled New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Internet Explorer\Main' -Name 'Isolation' -PropertyType String -Value 'PMIL' -Force | Out-Null