A firewall will not help you not be cheated at PP. If you are running Windows, anyone attempting to see your cards would need to have already infected your computer with a virus. There isn't anything they can do in Windows because there isn't any ability to run things remotely. Hence, if your computer is not infected with the virus, you do not need a firewall, and if your computer is infected with the virus, as firewall will provide minimal protection at best. But, like I said below, if you have this virus, poker at paradise is not the biggest of your worries.