Sometimes when upgrading from Vista to Windows 7 winsock needs to be reset in order to get your browser back online again. Try using the following commands to fix the problem.
1. Click start, type cmd in the Start Search box, right-click cmd.exe, click Run as administrator, and then press Continue.
2. Type netsh winsock reset at the command prompt, and then press ENTER.
Note If the command is typed incorrectly, you will receive an error message. Type the command again. When the command is completed successfully, a confirmation appears, followed by a new command prompt. Then, go to step 3.
3. Type exit, and then press ENTER. You should be prompted to reboot, if not you should reboot and test.