Go to Start> Run and type in CMD.EXE and then click OK.
When the black page with the white lettering opens type in the following and then click on enter.
rundll32.exe setupapi,InstallHinfSection DefaultInstall 132 %systemroot%\inf\au.inf
Running this command prompts you for the XP installation CD. Use Browse button and navigate to C:\Winnt\Servicepackfiles\I386 where wuapi.dll and other files related to Automatic Update Client can be found. After running this command, you must restart your computer.
Once restarted, you can open the Services control panel applet and check to ensure the Automatic Update Service is installed.http://www.wsuswiki.com/Proceduretomanuall...ticUpdateClient