I don't know if you can turn that game adapter into an access point.

If you can't get it to work, just try getting a new antenna for the router your currently using, that is, if it has a detachable antenna.

If so, heres an antenna I recommend:

FRYS.com*|*Airlink

Personally, I never trust Airlink101 products, cause they tend to not work. But I use this antenna on one of my computers, and it works really good. I get five bars all the time, fifty feet from the router.

Borgslayer