How do you successfully changer execution policy and activer execution of PowerShell scripts

I have a problem regarding changing the Execution Policy in my Windows Server 2008+ OS. It is the first time I try to run a script for which I need resource full access and I try the following after starting Powershell in elevated mode:

Set-ExecutionPolicy Unrestricted

But I get this:

Set-ExecutionPolicy : Windows PowerShell updated your execution policy
successfully, but the setting is overridden by a policy defined at a more
specific scope.  Due to the override, your shell will retain its current
effective execution policy of RemoteSigned. Type "Get-ExecutionPolicy -List"
to view your execution policy settings. For more information please see
"Get-Help Set-ExecutionPolicy".
At line:1 char:1
+ Set-ExecutionPolicy Unrestricted
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : PermissionDenied: (:) [Set-ExecutionPolicy], SecurityException
    + FullyQualifiedErrorId : ExecutionPolicyOverride,Microsoft.PowerShell.Commands.SetExecutionPolicyCommand

Though I am Administrator, I cannot change the Execution Policy. What to do?

The error message indicates that the setting you’re trying to define via Set-ExecutionPolicy is overridden by a setting in another scope. Use Get-ExecutionPolicy -List to see which scope has which setting.

`PS C:> Get-ExecutionPolicy -List

    Scope    ExecutionPolicy