Mbstring error when trying to access admin in local installation of XAMPP (Windows 7)

Hi just a little background. I have been trying to install a template in CMS Made simple on my paid-for hosting. I failed! So .. I thought maybe if I can istall Apache locally on my HD I can then try/test get the template working there, and then upload when I know it works. So I installed Xampp Control Panel v3.2.1, but when I type http://localhost/phpmyadmin/ in my address bar I get this error: The mbstring extension is missing.

In the xampp folder there is php/Configuration settings 77KB (Presumably Php.ini) there is "extension=php_mbstring.dll" with no semi-colon, and ";extension=php_mbstring.dll" In php/ext I cannot see php_mbstring.dll. How can I resolve this, thanks ...