The WAMP5 installer for Windows has been updated this week end. WAMP5 1.4.4 is now delivered with :
The mbstring extension has also been activated for the new PHPmyadmin.
By the way, the PHP4 add-on has been updated with PHP 4.3.11.
WAMP5 automatically installs Apache, MySQL, PHP5 (and PHP4 with a switch from one to the other) on your windows system.