Return Code -1

I searched google and I found a similar post to my question, but it
wasn't answered, so I suppose I could try my luck.

I'm just starting C, and I downloaded and installed lccwin smoothly.
Now I write:

#include <stdio.h>

int main() {
	printf("hello world\n");
	return 0;
}

which isn't overly complex at all. But when I compile and run it, I
get:

"C:\Do***ents and Settings\..............." etc
Return code -1
Execution time 0.011 seconds
Press any key to continue....

Why is this happening?

Thanks,