title: Activating virtual environment throws error in powershell
body: <p>I am using Windows PowerShell. But, I don't know why, when I try to activate a python virtual environment, I get this error:</p>
  <pre><code>venv\Scripts\activate : File C:\Users\Dell\Desktop\flask\microblog\venv\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.
  At line:1 char:1
  + venv\Scripts\activate
  + ~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : SecurityError: (:) [], PSSecurityException
      + FullyQualifiedErrorId : UnauthorizedAccess
  </code></pre>
  <p>This is the command I ran:</p>
  <pre><code>venv\Scripts\activate
  </code></pre>
  <p>This is the first time it has happened. What is the problem?</p>