when i used to use Win Xp pro for me Comodo 2.4 firewall was the best for me. Now i am in Vista Home premium i have used Comodo 3.0 and i don't like it because it stays stuck not responding. I use Avast Free antivirus i don't know if there are conflicts but my pc is more slow and Comodo stays stuck. Anyone has the same problem? ive tries to update but it stays stuck.