[Anyone having problems with AT&T DSL DNS server Issues with Second Life? (Windows 7)]

I had a strange problem with AT&T last week.  I installed SL after reinstalling my main computer and when i would use it, suddenly the DNS server would die, killing internet for all the computers on the whole network..  (3 total).  Once i managed to track down ithe issue i changed the DNS server to a public DNS to fix the issue, but its the first time this is ever happened to me -.-