Because the wampmanager.exe
that is the icon in the system tray is still a 32bit app, you also need all the 32bit MSVC Runtimes installed as well.
Remember, 64bit Windows will run 32 bit apps quite happily, therefore installing these is not a waste as you may find other apps that need these runtimes as well.
If you look at the bottom of this page WampServer backup repo you will see they have provided a single installer for all the MSVC Runtimes. So you can install all of the MSVC Runtimes in one simple installer.
You may get a dialog for those runtimes you already have installed, just click REPAIR for those.
Small Note: The first things the install does is throw a dialog telling you that these runtime libraries are required.
And if you did forget to install the MSVC runtimes before installing WAMPServer,it is best to uninstall WAMPServer and the reinstall it once you are sure all the runtimes have been installed