ng : File C:\Users\janarthanan\AppData\Roaming\npm\ng.ps1 cannot be loaded. The file code example

Example 1: File C:\Users\Tariqul\AppData\Roaming\npm\ng.ps1 cannot be loaded because running scripts is disabled on this system.

Set-ExecutionPolicy -ExecutionPolicy Unrestricted

Example 2: ng : File C:\Users\Sriram\AppData\Roaming\npm\ng.ps1 cannot be loaded because running scripts is disabled on this system. For more information, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.

deleting ng.ps1 everything was going in perfect way