CoD4/CoD5 Help needed.

I have some problems here.

On my own laptop I can play Call of Duty 4 and 5 with no problem, I can go online and I see all servers, got Vista and all.

Now, when I try to play either of those on my dads or brothers pc, I don't see any servers. I've already tried disabling firewall etc. allowing them in firewall. Forwarding port 28960, but doesn't seem to help. Only difference I see in their computers and mine is the OS, I got Vista, my dad and bro use XP.

But what happens when I try to refresh servers. Is it DOES see there are servers, it like says at the top 5/2895 servers. Always a 5, dunno why. But when it ends, the console says something along the lines of:

0 servers found (filtered out by game browser settings)

Weird thing is, game browser settings are set to allow anything trough it.

Either way, I need helps. Give please? :D

EDIT: /connect IP doesn't work either, it keeps awaiting connection.