Being Busted By Punkbuster! [CoD4]

Well, I recently bought CoD4 and it seems like a VERY fun game, however, when I join a server, I will last only a few moments before I'm kicked by Punkbuster with the message "<Name>'s Punkbuster kicked <name> for 0 minutes" ... "no packet flow."

I'm on Roadrunner wireless, is there anything I can do?

 

Well, to add to this: I have since update both CoD4 and Punkbuster, and now, rather than get the full server list (It tells me there are eight hundred and some) I see around ten servers, all with high ping. I have a very similar problem with CS:S.