please look at this simple code!

[Amon Ra]

Here:

wc.lpszClassName = "mycalss";

That is what the classname is, and here:

winhwnd = CreateWindow("myclass", "the title", WS_OVERLAPPEDWINDOW,
		0,0,34,34,NULL,NULL,hInstance,NULL);

the classnames are different. i changed them, and it worked