If my brother use one router and I use second router (We've two routers case) then I need unblock ports with all routers? "No nanacide" There is not have informations on it topic.
I've actually Windows Millenium (I use it actually).
When I open W:A, then game it is excluded or walks behind fastly. It by newest update or need other Windows? :-/

If my brother use one router and I use second router (We've two routers case) then I need unblock ports with all routers? "No nanacide" There is not have informations on it topic.

Well yes, in the same way that you've have to open both valves on a pipe for water to get through the whole length of the pipe.

Surely this is implied by the informations haved on it topic?

About error's W:A in Windows Millenium I ask first one ;)

Routers:
Yes, you should unblock ports on all routers.

Slow game?:
Windows Millenium is okay, but check your W:A version. Put your mouse on the "Worms Armageddon" logo on the menu screen. At the bottom of the screen you can see, "v1.0" or "v3.0".

If you have v1.0...
step 1) download patch: http://team17.rinux.net/patches_pc/WAPatch.exe
step 2) download update: http://team17.rinux.net/patches_pc/WA_Update-3.6.26.5_Beta.exe

If you have v3.0...
step 1) download update: http://team17.rinux.net/patches_pc/WA_Update-3.6.26.5_Beta.exe

Install these in your W:A folder and the game should play great.