cannot be loaded because running scripts is disabled on this system

  I was installing python in my windows 10 machine. 

then I create a virtual environment, I can't activate it. When I run, it says : 

".......\Scripts\activate.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. " 

after google the phase I have come the following solution : 

Step 01 : run Windows PowerShell

Step 02 : run the following script 

"Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Unrestricted"

Step 03: press "Y"  

When I activate virtual environment it works fine : 

check out link. I found this very helpful.