I have checked everything - all the processes in the process explorer. IP Helper service is causing CPU usage of over 50 % every 1 minute for 3-4 seconds then comes back to normal. In the task manager, the process is svchost.exe and the service is iphlpsvc.
Here's the result of "ipconfig /all" and "netsh interface teredo show state" command:
Also, uTorrent is not able to get the teredo address.