As above uninstall / remove in safe mode ( ensuring you have the latest network card driver to hand ) from relevant manufacturers website
Also just as some side notes to repair / re install TCP/IP and or winsock etc using command line / utils etc
http://windowsxp.mvps.org/winsock.htmhttp://support.microsoft.com/kb/299357http://support.microsoft.com/kb/811259Utils to help make said changes which will most likely require a reboot / restart after executing / running them
http://www.xp-smoker.com/freeware.htmlwww.cexx.org/lspfix.htmhttp://www.bleepingcomputer.com/files/lspfix.phpLSP FIX Tutorial
http://www.bleepingcomputer.com/tutorials/tutorial59.htmlWinsock Fix
http://www.home-network-help.com/winsockfix.html