bigger wires, can it damage my speakers?

I got 7.1 creative speakers. I want to extend the wires that came with those speakers. I bought speakers wires at Radio Shack put they are bigger then the wires that came with the creative speakers. If I hook the wires together can I damage my speakers?

Bigger wires.
Assuming you mean the copper inside the cable is bigger, then yes, bigger is better.

Saying that, you more than likely wont hear any difference as the power you running through them is so small.