on such problems, it's necessary to mention, that you use firewall and antivirus and which you're using.
It's also necessary for us to know, that you've tried to get internet access by disabling both.
BTW: If it has worked correctly in the past, I would never disable firewall or antivirus, because when disabling firewall, you open the door for viruses, trojans and spyware, to download and run things from the internet.
It's better, to check the logs of the firewall or antivirus for any hints on such internet problems.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!