Hotfix installation instructions: ================================ This hotfix replaces the TCPIP.SYS, AFD.SYS, and NETBT.SYS files in the \winnt\system32\drivers directory. The hotfix utility can be used to install hotfixes, and to track hotfixes that are installed. Type "hotfix /?" for usage instructions. To install this hotfix, put the new TCPIP.SYS, AFD.SYS, NETBT.SYS, hotfix.exe, and hotfix.ini in the same (temporary) directory, and then type: "hotfix /install" After installation, type "hotfix" to verify that it was installed correctly. Finally, reboot the system. Sample operation is shown below: C:\TEMP\synattack>hotfix /install Hotfix Version V1.4 copyright (c) Microsoft Corporation. \\MYCOMPUTER is Windows NT version 4.0, build 1381, No Service Pack Installing hotfix Q142641 TCP SYN-ATTACK UPDATE C:\TEMP\synattack>hotfix Hotfix Version V1.4 copyright (c) Microsoft Corporation. \\MYCOMPUTER is Windows NT version 4.0, build 1381, No Service Pack Q142641 TCP SYN-ATTACK UPDATE was installed on Oct 07, 1996 at 21:43:42 by administrator You must reboot the system for the Hotfixes to take effect.