So today is IPV6 day. Hopefully you haven’t been living under a rock for the last little while and know about it.
Read the following for instructions on how to disable ipv6 in windows 7:

1. Disable IPv6 for LAN adapter & interfaces

1. Open up the “Control Panel” and then the “Network Sharing Center”:

Network Sharing Center in Windows 7

2. Click on “Change adapter settings”:

Change Network Adapt Settings in Windows 7

3. Right-click on your network adapter, usually “Local Area Connection” and click on “Properties”:

Local Area Connection in Windows 7

4. Uncheck “Internet Protocol Version 6″ and click on “OK”:

Disable Internet Protocol Version 6
2. Disable IPv6 for tunnel adapter & interfaces

If you are not familiar with editing the registry, I created a .reg file for you that you can use to add the registry key and disable IPv6. To verify that this file is ok, open it with a notepad once, it only includes the following lines:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters]
“DisabledComponents”=dword:ffffffff

Link: Download Disable IPv6 Registry Tweak (.reg file)

Alternatively, you can simply do it yourself, it shouldn’t be too difficult:

1. Open up the registry.

Regedit.exe

2. Uncollapse [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\]

3. Next, we create a new 32-bit registry key: “DisabledComponents”:

By the way, even if you are on 64-bit system you have to create a 32-bit registry key only, because it only reflects the size of the registry key. A 32-bit registry key can store a maximum value of 2,147,483,647.

Create 32-bit DWORD registry key

4. Enter: “DisabledComponents” when prompted for a name.

DisabledComponents Registry Key

5. Double-click the newly created registry key and copy and paste the value: ffffff (8f)

6. Restart your PC and you are done: You just disabled IPv6 in Windows 7!