RTDX -- TI C2000

I'm facing following problem when incremental build my controller:

Error using ==> <a href="error:C:\Program
Files\MATLAB\R2007a\toolbox\shared\dastudio\@DAStudio\error.m,47,1">rtw_checkdir.p>rtw_checkdir
at 47</a>
Your current working directory is: 
 C:\Program Files\MATLAB\R2007a\toolbox\simulink\simulink\messages
The Real-Time Workshop does not permit you to build programs in the
MATLAB installation area. Please change to a working directory that
is not in the MATLAB installation area.

Anyone can help me?
How can i change working directory outside of MATLAB installation area?