When I go to Control Panel and choose Add/Remove Windows Components I get a screen that said: "Setup was unable to open the FILE au.inf.   Contact your system Administrator.  The specific error code is 0x2 at the line 2086412652."
I found that the au.inf file is used by Microsoft for sending automatic updates to the computer.  I have set my computer through the icon in Control Panel to receive automatic updates.  My OS is W2K and I am the Administrator but I do not know how to solve the problem.
All help will be very much appreciated.[timestamp=1170225244]I am answering my own question.  I found that the file au.inf was missing for reasons unknown to me.  I have W2K and also Win XP, so I copied the file au.inf from Win XP and put in C:\WINNT and it worked partially but there was a pop-up screen that was giving INFORMATION about another TWO files missing and I replaced them the same WAY and now the Add/Remove Windows Components is back on working conditions.
Hope this may help SOMEONE in the future.Glad you're fixed...System File Checker would have done the same thing.