hello people, i have machine running server4 and i accidently removed the protocol tcp\ip from it and now cannot i install it,when ever i try to install i recieve a message "registry subkey already exits".Please help.

Make sure all components given the tcp /ip service are removed. Then you have to delete multiple keys from the registry>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\CCS\Services\DHCP HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\DhcpServer HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\FTPSVC HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\Lmhosts HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\LPDSVC HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\NetBT HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\SimpTcp HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\SNMP HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\Tcpip HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\Wins HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\WinSock HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\WinSock2 HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\'NetDriver'x\Parameters\Tcpip where NetDriver is the name of network card installed on system and where x is the number of the network adapter. It may also be necessary to remove the following keys: HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_DHCP HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_Lmhosts HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_LPDSVC HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_NetBT HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_TCPIP HKEY_LOCAL_MACHINE\System\CCS\Services\LanManServer\Linkage\Bind HKEY_LOCAL_MACHINE\System\CCS\Services\LanManWorkstation\Linkage\Bind . You can look at the kb article #q151237 from microsoft.com site.