Sometimes, perhaps first time when you run the Angular application using ng serve command, you may face this compile time error : /ng.ps1 cannot be loaded because running scripts is disabled on this system. The solution to this problem is quite simple. Follow the steps in this video to resolve this issue.
[Solution]
Run Power Shell as administrator and execute this command :
Set-ExecutionPolicy Unrestricted
Then confirm your action with Y when asked.
Done, you are good to go.