I am assuming that you are typing in google.com in both the address bar and when you Ping, my first suggestion would be to open command prompt and type ipconfig /flushdns. You will release the DNS table stored, I would then try going to www.something.com in your browser. That will take you to a page that just has the word something in the top left. That will verify that you have a connection and your DNS is good. Make sure that your antivir and firewall are still disabled although I have not run into something like that before, but then try google and other sites as well. If not you might want to check your hardware firewall if you have a router. Past that will need some more info.
If the above does not work, open a command window. Type <b>telnet www.google.com 80</b>. The screen should go black. Type <b>get</b> and press enter. If content is returned in the window, you are able to get to websites. The problem then is likely your browser. You can download firefox onto a usb drive or get PortableApps Firefox and run it from the drive and see if you are able to browse the internet.
It doesn’t sound like a DNS issue. If you are using Internet Explorer 7, go to Start -> Accessories -> System Tools -> Internet Explorer 7 (no add-ons). This will open internet explorer 7 without addons and it should be working. Download firefox or fix the issue by removing all unneeded addons from internet explorer in tools -> Manage Add-Ons.