1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. In Registry Editor, locate the following keys, right-click each key, and then click Delete:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Winsock
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Winsock2
4. When you are prompted to confirm the deletion, click Yes.
Note Restart the computer after you delete the Winsock keys. Doing so causes the Windows XP operating system to create new shell entries for those two keys. If you do not restart the computer after you delete the Winsock keys, the next step does not work correctly.
Step 2: Install TCP/IP
1. Right-click the network connection, and then click Properties.
2. Click Install.
3. Click Protocol, and then click Add.
4. Click Have Disk.
5. Type C:\Windows\inf, and then click OK.
6. On the list of available protocols, click Internet Protocol (TCP/IP), and then click OK.If Internet Protocol (TCP/IP) does not appear, follow these steps:
a. Click Start, and then click Search.
b. In the Search Companion pane, click More advanced options.
c. Click to select the following three check boxes:
•Search system folders
•Search hidden files and folders
•Search subfolders
d. In the All or part of the file name box, type nettcpip.inf, and then click Search.
e. In the results pane, right-click Nettcpip.inf, and then click Install.
7. Restart the computer.
Manual steps to determine whether the Winsock2 key is corrupted for Windows Vista users
1. Click Start, click Run, type Msinfo32, and then click OK.
2. Expand Components, expand Network, and then click Protocol.
3. Ten sections appear under Protocol. The section headings will include the following names if the Winsock2 key is undamaged:
• MSAFD Tcpip [TCP/IP]
• MSAFD Tcpip [UDP/IP]
• MSAFD Tcpip [TCP/IPv6]
• MSAFD Tcpip [UDP/IPv6]
• RSVP UDP Service Provider
• RSVP TCP Service Provider
• RSVP UDPv6 Service Provider
• RSVP TCPv6 Service Provider
• MSAFD NetBIOS [\Device\NetBT_Tcpip...
• MSAFD NetBIOS [\Device\NetBT_Tcpip...
• MSAFD NetBIOS [\Device\NetBT_Tcpip...
• MSAFD NetBIOS [\Device\NetBT_Tcpip...
• MSAFD NetBIOS [\Device\NetBT_Tcpip...
• MSAFD NetBIOS [\Device\NetBT_Tcpip...
If the names are anything different from those in this list, the Winsock2 key is corrupted, or you have a third-party add-on such as proxy software installed.
If you have a third-party add-on installed, the name of the add-on will replace the letters "MSAFD" in the list.
If there are more than ten sections in the list, you have third-party additions installed.
If there are fewer than ten sections, there is information missing.
Note These entries represent an installation with only the TCP/IP protocol installed. You can have a working Winsock and see additional entries if another protocol is installed. For example, if you install NWLink IPX/SPX, you will see 7 additional sections, for a total of 17. Below is an example heading of one of the new sections:
MSAFD nwlnkipx [IPX]
Also, each of the new sections that are created by installing NWLink IPX/SPX start with "MSAFD." Therefore, there are still only two sections that do not start with those letters.
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