The linker said that _main is a "nichtaufgelöstes externes symbol". This is the definite hint that a _main function is missing. And since _main is for i.e. DOS and WinMain is for Windows i suspect that your project is not a win32 executable but dos exec.
So maybe it helps to create a new WIN32 project and try it out again.

Incommunicado

oh yeah...i had a consoleapplication(or something like this)...that''s kinda embarrassing...but thanks