Service Pack 3 connection trouble

i updated my win xp-pro with sp3 on july 7 and bang no internet connection…
Question: Is there a any setting that i need to change or anything else i should know about this update?
i looked for drivers for the nic, router, and modem, noting there just yet.

!!!!UPDATE!!!!
OK i checked the DNS and all the connection functions, no problem with them. it was the Firewall, ofcourse. seems that there is a change in sp3 that afects how all the DNS and Ports are assinged. so i got the update for the firewall and bang! it works.

thanks for your help, hope this helps anyone else that has problems with win xp SP3.