As with any tool as versatile as Windows PowerShell, there are some security concerns. Security, however, was one of the design goals in the development of Windows PowerShell.
When you launch Windows PowerShell, it opens in your Users\userName folder; this ensures you are in a directory where you will have permission to perform certain actions and activities. This technique is far safer than opening at the root of the drive or opening in the system root.
To change to a directory, you can't automatically go up to the next level; you must explicitly name the destination of the change directory operation (but you can use the dotted notation with the Set-Location cmdlets as in Set-Location ..).
Running scripts ...