Powershell Administrator Permission Denied when modifying the UAC - windows

Question

I'm trying to modify the permissions of the UAC with a powershell script that looks like:
Start-Process powershell -Verb runAs Administrator
Set-ItemProperty -Path registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\policies\system -Name EnableLUA -Value 0
$UAC = Get-ItemProperty -Path registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\policies\system -Name EnableLUA
$UAC.EnableLUA
Even though I am running the script as administrator, I still get the following error:
Set-ItemProperty : Requested registry access is not allowed. At
C:\Users\Bert\Desktop\autoLims.ps1:8 char:17
+ Set-ItemProperty <<<< -Path registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\policies\system
-Name EnableLUA -Value 0
+ CategoryInfo : PermissionDenied: (HKEY_LOCAL_MACH...policies\system:String) [Set-ItemProperty],
SecurityException
+ FullyQualifiedErrorId : System.Security.SecurityException,Microsoft.PowerShell.Commands.SetItemPropertyCommand
Any ideas why it wont run the script even though I am running the script as administrator? Is there something else I need to change?

Answer 1

The -Verb parameter only takes one argument e.g. print. In the case of elevation it will be RunAs which will run the process with the current user's full privileges.
From the Start-Process documentation:
-Verb <String>
Specifies a verb to use when starting the process. The verbs that are available are determined by the file name extension of the file that runs in the process.
The following table shows the verbs for some common process file types.
File type Verbs
--------- -------
.cmd Edit, Open, Print, Runas
.exe Open, RunAs
.txt Open, Print, PrintTo
.wav Open, Play
To find the verbs that can be used with the file that runs in a process, use the New-Object cmdlet to create a System.Diagnostics.ProcessStartInfo object for the file. The available verbs are in the Verbs property of the ProcessStartInfo object.