mex –setup cannot run

Dear all,

My matlab worked fine a few week ago, but I has some problem since I installed C++ professional 2013. Now "mex –setup" cannot run. The error is

 mex –setup

C:\PROGRA~1\MATLAB\R2012A\BIN\MEX.PL: Error: '–setup' not found.

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

Anybody know how to slove this problem? I installed SDK 7.1.

Thanks very much.

Xiwang Li