Display a custom message when installation is prevented by a policy setting: registry value DetailTextComputerHKLM\Software\Policies\Microsoft\Windows\DeviceInstall\Restrictions\DeniedPolicy
- Policy ID
- DeviceInstall_DeniedPolicy_DetailText
- Scope
- Computer Configuration
- Supported on
- At least Windows Vista
- Source
- Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
- Category
- System › Device Installation › Device Installation Restrictions
Registry
DetailText
REG_SZComputer- Enabled value
- Depends on the option value
- Element
- Detail Text
- Value type
- REG_SZ
- Required
- true
- Maximum length
- 128
Apply with .reg · CMD · PowerShell
.reg
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeviceInstall\Restrictions\DeniedPolicy] ; Value names and types follow the ADMX. Replace <enter value> below with your own data "DetailText"="<enter value>"
CMD
:: Value names and types follow the ADMX. Replace <enter value> below with your own data reg add "HKLM\Software\Policies\Microsoft\Windows\DeviceInstall\Restrictions\DeniedPolicy" /v "DetailText" /t REG_SZ /d "<enter value>" /f
PowerShell
# Value names and types follow the ADMX. Replace <enter value> below with your own data New-Item -Path 'HKLM:\Software\Policies\Microsoft\Windows\DeviceInstall\Restrictions\DeniedPolicy' -Force | Out-Null New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\DeviceInstall\Restrictions\DeniedPolicy' -Name 'DetailText' -PropertyType String -Value '<enter value>' -Force | Out-Null