XP TCP/IP Repair is a Graphical User Interface (GUI) for commands in Windows XP that repair your TCP/IP registry settings and your Winsock LSP settings. Instead of having trying to remember long confusing command line options you can now just click a button. What is an LSP? Layered Service Providers (LSP) are small pieces of software that can be added or inserted into the Windows TCP/IP handler by other software. Data outward bound from your computer to a legitimate destination on the Internet can be intercepted by an LSP and sent somewhere other than where you intend it to go.