Comment 18 for bug 1220504

Hello bobptz,
jockey is the tool for installing proprietary drivers in Precise,
you can open it by searching "Additional Drivers" in your dash

if you're using other distribution, it will be another tool called "software-properties-gtk"

To your question, I will suggest you to make sure your driver does not work before you re-install the driver, if it's still working outside the coffee shop, this might be a problem from the shop owner's router setting, not a driver issue.