Also having this problem.
win7, 2500 pings on most servers, and 500+ on the rest.
Using windows firewall, arma2 enabled there.
Tried with and without virus scanner running. Tried reinstalls. Tried running as admin, with firewall off, with uac off...etc etc.
Nothing seems to be fixing this.
Connected to cable moden through a hub. Also connected to the internet through that hub is a 2nd computer running win xp...sitting on the desk next to the windows 7 computer with 2500 pings....the xp computer has normal pings in the 40 range and up and has always run fine.
So...the problem would seem to be something to do with the windows 7 box in particular.
I know of at least one other person, besides those posting here...who's had this problem...yet there seems to be a surprising lack of posts/info concerning it...and certainly no response from the BI devs.
Any ideas?