Well you honestly don't have any idea what you are doing.
The exploit is called "Microsoft Internet Explorer "Aurora" Memory Corruption (MS10-002)" if it's an exploit for IE why are you using Firefox as the browser ?
Do you have a firewall ? Are you behind a router ?
If you can get a session if you load the payload into the victims PC and run it than the problem is the exploit. So I would suggest you read up on exploits before actually using them.