.h not working

whenever i use any of the source code from this website that includes
#include <something.h>
my compiler (Visual Studio C++ Command line) fails and says:
Notepad1.cpp(4) : fatal error C1083: Cannot open include file: 'something.h': No such file or directory
i am sure that it has something to do with the .h.
I am using Vista SP2, although i will be installing 7 within the week.
???
The Sourcecode section of this website ( http://www.cplusplus.com/src/ ) contains some very old code. New standard headers don't have the .h extension. But you'll need to be more specific about something.h
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