On USEAST on about 3/4 of the games i play i either lag bad or get dropped at the beggining. I have a wireless router, dsl internet and i dont know why i lag so much. my computer is kinda old but when i used to play years ago i never had these issues, at least not nearly as much. thinkin about formating my hdd but its such a hassle wonder if anyone could advise me on how i might fix this. my lag when i enter b.net is one green, when i join a game its usually 3y - 6 r. im getting frustrated cuz i cant usually get a public game goin without laggin horribly or getting dropped. UMS are the worst.

Internet is at&t if that matters, any advice would be appreciatted.

im seconding this, whenever i join a game i get a black screen for like 20 seconds then it'll say "game host has left" when they havn't or, ill join and everything will be fine for a few seconds, ill see everyones names and stuff but then everything will get quiet and it'll tell me the game host has left... when, again, they havn't

I have a issue where I join any sc game and once game starts i got o lag screen lag out and blizzard ignores my emails my sc was working fine for 5 weeks at least now this I cant play any games on sc my wc3 is fine though is it same for you?

Be connected to your router with a wire. Wireless is unstable and laggy and untrustworthy.

You'll need to configure your router and/or any firewalls you may have. You can learn how to do so here:
(http://forums.battle.net/thread.html?topicId=10863439009).
Please note that disabling your firewall will not cut it.