error C2371: 'wchar_t' : redefinition; different basic types PROBLEMS

[merrittr]

I am trying to compile a C program in VS 2005 c++ compiler I am
getting this error:

Error 2 error C2371: 'wchar_t' : redefinition; different basic types C:
\Program Files\Microsoft Visual Studio 8\VC\include\crtdefs.h 522
Error 3 error C2371: 'time_t' : redefinition; different basic types C:
\Program Files\Microsoft Visual Studio 8\VC\include\crtdefs.h 580

I have set Configuraion Properties>C/C++>Language>Treat wchar_t as
Built-in Type : No (/Zcwchar_t-)

What else can I do to eliminate these errors