PCH stands for 'Pre Compiled Header', so you've created a project that requires a PCH but you didn't include it.
Just add #include "stdafx.h" as the very first line in your code.
Or turn PCH off, but since you didn't tell which compiler (version) you're using, I can't help you with that.
One more thing: if you post code here, please post it between [code=cpp] // code here
[/code] tags. It makes your code easier to read and preserves formatting.