I am not able to connect to the internet using my chrome and opera browser while I am able to browse perfectly using Firefox.I am using Windows 7 and my connection is ADSL and using a Netgear wireless router
Is the Windows Firewall blocking the outgoing connections?
I don't have Windows 7 installed on this machine so I can't check the options you need, but check that it's set to "ask" or "prompt" when a new program tries to make an outgoing connection.
If it is set that way check the current rules to see if Chrome and Opera have been blocked.
Have you checked the Proxy settings?
Options -> Under the hood -> change proxy settings
If you're using it at home probably you just habe to clear al the proxy settings