How To Install Wamp Server To Window Server 2008 R2

Be sure you have the latest version of all of these Microsoft C++ Redistributable runtime libraries.

The 2008 Redist is used by wampmanager
The 2010 Redist is used by some versions of Apache ( depending on compiler used )
The 2012 Redist is used by some versions of Apache ( depending on compiler used )

FOR WAMP 32bit
Microsoft Visual C++ 2008 SP1 Redistributable Package (x86) 
Microsoft Visual C++ 2010 SP1 Redistributable Package (x86) 

If you are using WampServer 2.4
Microsoft Visual C++ 2012 [www.microsoft.com]
And select vcredist_x86.exe

FOR WAMP 64bit
Microsoft Visual C++ 2008 SP1 Redistributable Package (x86) [Yes you need the x86 Package regardless]

Microsoft Visual C++ 2008 Redistributable Package (x64) 
Microsoft Visual C++ 2010 SP1 Redistributable Package (x64) 
If you are using WampServer 2.4
Microsoft Visual C++ 2012
And select vcredist_x64.exe