Some time ago I downloaded and used the free Comodo firewall program. This seemed to work very well, and did as it was supposed. Somehow over a period of time this morphed into something called Comodo Internet Security, which became a bit of a hassle in its operation. I recently uninstalled the whole program which greatly increased the speed with which my computer now responds to commands and opens windows in the browser. Today I thought I would install the stand-alone firewall, but it seems that this is now available only as part of the security suite, which I don't want to revisit, as NOD32 is better. Do I really need another firewall, and is there an alternative to Comodo?