I get a popup with the following message when I try to start the server from my desktop icon "php_mbstring.dll is missing" i'd send you a capture but there seems to be no way to do that...
left click on the wampmanager icon in the system tray -> PHP -> Extensions
In the menu that appears at that point, check that 'php_mbstring' has a tick by it, if not click on that line and it will activate that extension, and restart apache.
Gave it a try, the php_mbstring is checked the message still says "php_mbstring.dll is missing" and suggests reinstalling the program but reinstalls do not help....