How to reinstall the TCP/TP stack.

This procedure can be used to reinstall Internet Protocol Version 4 (TCP/IPv6) or Internet Protocol Version 6 (TCP/IPv6).

1. Click the Start button and then click Control Panel.
2. In the Control Panel window, click Network and Internet.
3. In the Network and Internet window, under Network and Sharing Center, click View network status and tasks.
4. In the Network and Sharing Center window, click View Status.
5. In the Wireless Network Connection Status window, click the Properties button.
6. In the Wireless Network Connection Status window, in the This connection uses the following items: section, click to select Internet Protocol Version 4 (TCP/IPv4) or Internet Protocol Version 6 (TCP/IPv6) and then click the Install button.
7. In the Select Network Feature Type window, click to select Protocol and then click the Add... button.
8. In the Select Network Protocol window, click to select Reliable Multicast Protocol and then click the Have Disk... button.
9. In the Install From Disk window, in the Copy manufacturer's files from: textbox, type: c:\windows\inf and then click the OK button.
10. In the Select Network Protocol window, in the Network Protocol: section, click to select Internet Protocol Version 4 (TCP/IPv4) and then click the OK button.
11. Restart the computer.