If you are using quite new version of compiler (and I think that you do), do not even bother including iostream.h. This file is obsolete and put into libraries for backward compatibility only. The same functionality, but conforming to curent standards, is placed inside of iostream, so just put
Code:
#include <iostream>
line in your app.

Maybe before you were using backward-compatible libraries which included iostream.h, and now switched to more modern one.

Hob