XP Woes : No application able to connect to internet

[Ecko]

Just Firefox & Opera are able to connect to internet also uTorrent Works Fine
Rest everything else is not able to access internet including Chrome ,IE & Yahoo Messenger
Please Help
Looks like a DNS issue to me so even I changed the DNS address to Open DNS
I'ven't Installed any updates recently

[ThinkFree]

Using any security suite or firewall? If yes, see if these apps work after disabling firewall.