TCP/IP cannot be uninstalled with recent versions of Windows. To “reset” TCP/IP for troubleshooting purposes, launch a command prompt with administrative privileges and use the following command:
netsh int ip reset c:\logname.txt
Another command to use if an issue persists would be:
netsh winsock reset
A Fix-IT option is available at http://support.microsoft.com/kb/299357 for resetting TCP/IP.