How can I eliminate the following error?

When I was trying to create s-function from simulink block ......I am always getting error like this...

An installed compiler was not detected. Certain simulation modes, as well as host-based coder builds require that a compiler be installed. Please install one of the supported compilers for this release as listed at: http://www.mathworks.com/support/compilers/R2013a/win64.html........

I have installed microsoft windows sdk 7.1 .... I have chosen the ms windows sdk for compilation by using the command mex -setup Eventhough I am getting error like this mentioned above.... Please help me.....