How to Use Windows PowerShell to Modify or Remove a Registry Key Value

If you want to modify or remove a property of a specific registry key, then the following excerpt from the new O'Reilly book Windows PowerShell Cookbook, Second Edition can be of service.

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To set the value of a registry key, use the Set-ItemProperty cmdlet:

PS > (Get-ItemProperty .).MyProgram
c:\temp\MyProgram.exe
PS > Set-ItemProperty . MyProgram d:\Lee\tools\MyProgram.exe
PS > (Get-ItemProperty .).MyProgram
d:\Lee\tools\MyProgram.exe

To remove the value of a registry key, use the Remove-ItemProperty cmdlet:

PS > Remove-ItemProperty . MyProgram
PS > (Get-ItemProperty .).MyProgram

In the registry provider, PowerShell treats registry keys as items and key values as properties of those items. To change the value of a key property, use the Set-ItemProperty cmdlet. The Set-ItemProperty cmdlet has the standard alias sp. To remove a key property altogether, use the Remove-ItemProperty cmdlet.

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Warning: As always, use caution when changing information in the registry. Deleting or changing the wrong item can easily render your system unbootable.

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For more information about the Get-ItemProperty cmdlet, type Get-Help Get-ItemProperty. For information about the Set-ItemProperty and Remove-ItemProperty cmdlets, type Get-Help Set-ItemProperty or Get-Help Remove-ItemProperty, respectively. For more information about the registry provider, type Get-Help Registry.