Now type or copy and paste the commands below one at a time hitting enter after each.
set state disabled
Open your device manager hit the start button then right click on computer then select properties then select device manager.
In device manager, click the View menu and select Show hidden devices
Then in the view drop down menu select devices by connection.
Left click the Network Adapters tree.
Right click on Teredo Tunneling Pseudo-Interface and select Disable.
Right click on 6to4 Adapter and then select Disable.
You will need to re-peat until all are disabled then reboot,and check you connection speed by say going to youtube and checking a video.