Comodo is notorious for false positives. It tends to flag legitimate, obscure, or custom software as "Unrecognized" or malicious. On Windows XP, where users are often running older, abandoned software or legacy drivers, this becomes a frequent annoyance. You will spend time manually adding files to the "Trusted" list.
If you are forced to use Windows XP for legacy industrial software or nostalgia, Comodo provides arguably the strongest technical defense available for the platform. However, you pay for that security with patience and system resources. comodo internet security xp
If you are still on Windows XP, your options are slim: Comodo is notorious for false positives