npm error "cannot be loaded because running scripts is disabled on this system"| Set-ExexutionPolicy

You must set the PowerShell Execution Policy from Restricted to RemoteSigned or Unrestricted to allow local PowerShell scripts to run.
For more information about PowerShell Execution Policy, type help about_signing or help Set-ExecutionPolicy at the PowerShell command prompt.
Procedure
Select Start -- All Programs Windows PowerShell version Windows PowerShell.
Type-- Set-ExecutionPolicy RemoteSigned -- to set the policy to RemoteSigned.
Type Set--ExecutionPolicy Unrestricted --to set the policy to Unrestricted.
Type Get-ExecutionPolicy to verify the current settings for the execution policy.
Type Exit.