file cannot be loaded because running scripts is disabled on this system

Encounter the following error when running powershell ?
File cannot be loaded because running scripts is disabled on this system. For more information, see about_Execution_Policies at //go.microsoft.com/fwlink/?LinkID=135170.
At line:1 char:1
CategoryInfo : SecurityError: (:) [], PSSecurityException
FullyQualifiedErrorId : UnauthorizedAccess

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