How to install and uninstall IPv6

To install IPv6:-
Start, point to All Programs, point to Accessories, and then click Command Prompt.At the command prompt, type: ipv6 install and press the Enter Key.

To uninstall IPv6:-
Start, point to All Programs, point to Accessories, and then click Command Prompt.At the command prompt, type:netsh int ipv6 uninstall and press the Enter Key.
Restart the computer.
To disable IPv6 in Vista:
1.Click Start, click Control Panel, and then double-click Network Connections.

2.Right-click any local area connection, and then click Properties.

3.Click Microsoft TCP/IP version 6 (for Windows XP with SP2 or later or Windows Server 2003) or Microsoft IPv6 Developer Edition (for Windows XP with SP1), and then click Uninstall.

4.When prompted to confirm the removal of the Microsoft IPv6 Developer Edition or Microsoft TCP/IP version 6 protocol,
click OK.