instead of testing the TCP/IP stack, I went straight for the repair using these instructions

- Windows 8 users press [Windows Key] + [X] and select Command Prompt (Admin).
- At the command prompt type: "netsh winsock reset catalog" and press [Enter].
- Next type: "netsh int ip reset reset.log" and press [Enter].
- Restart your PC for the changes to take effect.

This had no effect either. If this isn't what you meant, or if you think I should perform all the tests outlined at http://support.microsoft.com/kb/169790 ,then please let me know. However, some of those tests didn't seem relevant or helpful (some I knew were going to fail)