PowerShell Error: the execution of scripts is disabled on this system

When you run powershell scripts (.pl1), in Windows PowerShell console you may received following error.

 

 

File C:\Projects\Microsoft.Practices.ESB\Source\Samples\Management 
Portal\Install\Scripts\Management_Install.ps1 cannot
be loaded because the 
execution of scripts is disabled on this system. Please see "get-help 
about_signing" for more de
tails.
At line:1 char:25
+ 
.\Management_Install.ps1 <;;;<<< 1
 + 
CategoryInfo : 
NotSpecified: (:) [], PSSecurityException
 + 
FullyQualifiedErrorId : RuntimeException 

To fix this, run following command, in the console

set-executionpolicy unrestricted

On 64bit version of Windows 2008R2, also make sure to set this command for 64bit  PowertShell, which can be found in C:\Windows\SysWOW64\WindowsPowerShell\v1.0 

After you done, it is recommended to revert the setting by using

set-executionpolicy restricted

        OR

set-executionpolicy default