Repair the Windows 8/7/Vista TCP/IP Stack

If you’ve tried everything you can think of to cure an Internet connection problem without success, it could well mean that Windows TCP/IP parameters have become corrupt. This often happens when a virus has been removed from your system but left behind some damage. It can also happen when you remove security software such as a firewall, which is deeply integrated with the Windows networking system.
To fix the problem you need to reset the Windows networking stack. Fortunately Windows 8/7/Vista comes with a built-in tool you can use to do this:
  1. Click Start > All Programs > Accessories, right-click on Command Prompt and choose Run as administrator. Windows 8 users press [Windows Key] + [X] and select Command Prompt (Admin).
  2. At the command prompt type: netsh winsock reset catalog and press [Enter].
  3. Next type: netsh int ip reset reset.log and press [Enter].
  4. Restart your PC for the changes to take effect.

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