Do you have Perl installed on your OS? What OS are you using?
If No you need to install it.
If you have windows/Mac you can download ActiveState Perl. It's free and works great.
Locate where the 'perl.exe' is and make sure the path of the perl executable is on the same path of the first line in the script
If you install active state I recommend you use the default path "C:\perl"
Then you can change the first line in the script to