Do I need a software firewall in addition to a hardware (wireless router) firewall? The reason I ask is that I've been trying to configure lauded firewall Comodo off-and-on all weekend (so that it gets along with other applications), but with limited success. Previously, I used Zone Alarm as software firewall, but it was causing my whole computer to slow down given various circumstances. Since installing Comodo, it has blocked zero intrusions which means that either it's junk (which doesn't seem likely, given how often it's recommended on various sites) or that my wireless router is doing its job. Thoughts? Thanks.