You have been running it powered havent you? it should have just beeped at you if you didnt. Just use a slightly older version than you have. For some reason its quite common for both ati and nvidia to release drivers that just dont work on a number of cards.God knows why they must just be n0oBs
As for the lag run tracert on the ip addresses and see if theres an obviously dodgy hop and see where in the routing it is