The program can’t start because MSVCR100.dll is missing from your computer. Try reinstalling the program to fix this problem.

When you install WAMP Server into your System as first ( here First means, after install your Operating System ), You may get following Error,

The program can’t start because MSVCR100.dll is missing from your computer.
Try reinstalling the program to fix this problem.

You can go here for Causes and Solutions:
http://www.steptoinstall.com/msvcr100-dll-is-missing-when-wamp-server-install.html