BF2 connection problems again

hello i have posted this before for my other computer and i am getting the same problems with this one but this one i cant stop...
and i know this should be in the games section but too few people read in there so i have posted it in here as this problem has been bugging me for a long time. plus a game is softweare.

ok so my question is ths. i downloaded the demo for battlefield 2 about 5 weeks ago and it has been running smoothly when i play online or otherwise. but since last week i have been playing the game and i keep getting the dreadded yellow writin "there is a connection problem" (or something like that .) then it stays on for about a min and goes this happens all the time so i get shot or i crash the jet blah blah blah, now i have the full game it still happens and like i said i fixed it on the other pc but on this it wont stop.
so i have had a look an google and it turns out that many people are having this problem. i have tried out much of the stuff google comes up with, to no satisfaction. the dreadded yellow text still pops up and it still stalls for a while.

ok so here is what i have already tried so you dont have to waste your time telling me what i have allready done.

i have already disabled my firewall anti virus the lot. no change.

i have cheacked that i am connected the the internet and that my wirless connection is sercure.

i have reinstalled the game

and i have updated the punkbuster sofrweare...

(the internet also says that i have to open sone connection ports, but i dont know what they are and how to open them, so i have skipped that idea. plus the game was working when i first got it so i dont think some have shut down, (have they.)

ok anyone know how to help me please do thanks in advance. it would be GREATLY apreciated.

UKARMYCADET