If you uninstalled TCP/IP and can't reinstall install it, use regedt32 to delete the following keys (and their sub-keys):
HKEY_LOCAL_MACHINE\Software\Microsoft\DhcpMibAgent HKEY_LOCAL_MACHINE\Software\Microsoft\DhcpServer HKEY_LOCAL_MACHINE\Software\Microsoft\FTPSVC HKEY_LOCAL_MACHINE\Software\Microsoft\LPDSVC HKEY_LOCAL_MACHINE\Software\Microsoft\NetBT HKEY_LOCAL_MACHINE\Software\Microsoft\RFC1156Agent HKEY_LOCAL_MACHINE\Software\Microsoft\SNMP HKEY_LOCAL_MACHINE\Software\Microsoft\SimpTcp HKEY_LOCAL_MACHINE\Software\Microsoft\Tcpip HKEY_LOCAL_MACHINE\Software\Microsoft\TcpipCU HKEY_LOCAL_MACHINE\Software\Microsoft\TcpPrint HKEY_LOCAL_MACHINE\Software\Microsoft\Wins HKEY_LOCAL_MACHINE\Software\Microsoft\WinsMibAgent HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DHCP HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DhcpServer HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\FTPSVC HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Lmhosts HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LPDSVC HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SimpTcp HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SNMP HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Wins HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinSock HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinSock2 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\<NetDriver>x\Parameters\Tcpipwhere <NetDriver> is the name your NIC and x is the number.
You may have to use Regedt32 / Security / Permissions to grant Administrator Full Control, before you remove the following keys:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\Root\Legacy_DHCP HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\Root\Legacy_Lmhosts HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\Root\Legacy_LPDSVC HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\Root\Legacy_NetBT HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\Root\Legacy_TCPIP HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManServer\Linkage\Bind HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManWorkstation\Linkage\BindShutdown and restart your computer.
You should now be able to install TCP/IP.
NOTE: Don't forget to re-apply your latest Service Pack, after the TCP/IP install.
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