How to install Teredo Tunneling Pseudo-Interface

Hi DocBrown,

Follow the steps mentioned below:

First, let’s temporarily disable antivirus software and Firewall on the computer as a test.

Note: Make sure you turn-on the antivirus software and Windows Firewall later.

Now, let’s verify the status of relevant services required.

1. Click Start , type services.msc in Start search box and hit Enter.

2. Right-click the Peer Networking Grouping service and select Properties .

3. Check if the service is started; if not, right-click and select Start .

4. You may also set the Startup type to Automatic under Properties .

5. Click OK .

Repeat the above steps for the service PNRP Machine Name Publication Service , too.

Next step would be to modify IPv6 registry key to enable IPV6:

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

How to back up and restore the registry in Windows

http://support.microsoft.com/kb/322756/

1. Click Start , type regedit in Start Search Bar and hit Enter.

Note: If you are prompted for an administrator password or confirmation, type your password or click Continue.

2. Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters

3. Check whether DisabledComponents registry key exists. If yes, let's proceed to the next step.

4. Double click the DisabledComponents registry key and modify the value to 0 .

If the DisabledComponents entry is unavailable, you must create it. To do this, follow these steps:

   1. In the Edit menu, point to New , and then click DWORD (32-bit) Value .

   2. Type DisabledComponents , and then press ENTER.

   3. Double-click DisabledComponents .

Type 0 to enable all IPv6 components.

5. Exit Registry Editor, and then restart the computer.

Refer:

How to disable certain Internet Protocol version 6 (IPv6) components in Windows Vista, Windows 7 and Windows Server 2008

http://support.microsoft.com/kb/929852

Hope this helps.