It seems I can't write under policies, but directy I can. I need to alter something in registery under Policies. Is this doable?
New-Item -Path "HKCU:\SOFTWARE\Policies\Microsoft\Windows\System" -Force
New-ItemProperty -Path "HKCU:\SOFTWARE\Policies\Microsoft\Windows\System" -Name DisableAcrylicBackgroundOnLogon -Value "1" -PropertyType DWord -Force
= access denied
New-Item -Path "HKCU:\SOFTWARE\Microsoft\Windows\System" -Force
New-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Windows\System" -Name DisableAcrylicBackgroundOnLogon -Value "1" -PropertyType Dword -Force
= success