Sketch download problem

I have purchased Duemilanove board but I am facing the sketch download problem. Download is only possible when I touch digital pin nos. 4,5 & 6 simultaneously.
If any one know this problem or have knowledge please help me.
Thanks.

I have purchased Duemilanove board but I am facing the sketch download problem. Download is only possible when I touch digital pin nos. 4,5 & 6 simultaneously.

This makes no sense.
Did you already try to upload a skeetch under Files -> Examples ->