I cannot see my c-compiler in matlab

Matlab 2012a on Windows7.

I want to simulate a simulink model. However, it shows error like this.

/////////////////////// Unable to locate a C-compiler required by Stateflow and MATLAB Function blocks. Use 'mex -setup' to select a supported C-compiler. ///////////////////////

So I tried to use the command 'mex -setup' on matlab command window. But, it shows no compiler! msgs are like this

///// Welcome to mex -setup. This utility will help you set up a default compiler. For a list of supported compilers, see http://www.mathworks.com/support/compilers/R2012a/win64.html

Please choose your compiler for building MEX-files:

Would you like mex to locate installed compilers [y]/n? //////////////////

But I installed, visual studio 2012 and also windows SDK 7.1 which support Matlab. I checked the list at http://www.mathworks.com/support/compilers/R2012a/win64.html

What can I do for it more?

Thanks in advance.

2. Additional question. I didn't add any C code to the simulink model. Is is correct for Matlab to use C-compiler for the model, even I didn't do anything with C?

Answer 1

[Image Analyst]

Did you say "y" to the question "Would you like mex to locate installed compilers [y]/n?"

[Bumkyu]

yes. but it says this

/////// Would you like mex to locate installed compilers [y]/n? y

No supported SDK or compiler was found on this computer. For a list of supported compilers, see http://www.mathworks.com/support/compilers/R2012a/win64.html

Error using mex (line 206) Unable to complete successfully. ////////////////

Don't know what to do :(

[Image Analyst]

Call Mathworks tech support.