I have installed the latest free version of avast and comodo(FW/D+)and I find my downloading softwares and on-line games are extremely affected. So I want to know whether I should uninstall the network protection part since it’s function is similar to firewall.
Hi,
I do use avast! FREE + Comodo (FW/D+) on another PC. But there is no issues @ all. I hope you have restarted your PC after installing security softwares. Did you try disabling avast or Comodo to see which affects on downloading or on-line games? Or you can try adding Comodo and avast to respective exclusion lists.
BTW let us know your O/S and what additional security softwares on your PC.
Cheers…
Short answer is no, try setting exclusions between avast and comodo which should enable the system to run lighter.
Nothing else. I have just installed avast and comodo.
Alright… 
Can you just disable Comodo and see still problem persists?
Cheers…
Have you been using any antivirus or security tools before avast and comodo? Do you have any pre-installed security tools?
Both types of situations require from you to uninstall older / prior security tools and also to run the respective removal utilities for each such prior security tools. Partial list located at http://singularlabs.com/uninstallers/security-software/.
Network Shield is not a firewall.
Something is bad interacting with avast, probably some Comodo feature? ???