How to open ports

hello everybody!
Recently i started to use avast
I dont really know how is work and if anybody know how to open ports
i have problem with 4662, 80
Where i can check this

avast! is not a firewall - i.e. it certainly doesn’t block your ports…
Could you describe your problem a little more?

Knowing what firewall program you use would be helpful

Recently I have change a mother board
and in the shop they install me avast.
I thought that avast check I-net like a Norton Firewall
I use WinXP.