Did you do a repair install?  I had the same problem.  Here is the solution that 
worked for me.  The link to the whole article can be found at the end of this post.


If you find that Windows Update refuses to install most patches, you can register 
its missing DLLs yourself. This can be accomplished by manually entering seven commands 
(shown in Step 2, below) at a command prompt. If you need to run the fix on multiple 
machines, it's easiest to use a batch file, as Steps 1 through 5 explain:

Step 1. Open Notepad (or any text editor).

Step 2. Copy and paste the following command lines into the Notepad window (the /s 
switch runs the commands silently, freeing you from having to press Enter after each 
line):

regsvr32 /s wuapi.dll
regsvr32 /s wuaueng1.dll
regsvr32 /s wuaueng.dll
regsvr32 /s wucltui.dll
regsvr32 /s wups2.dll
regsvr32 /s wups.dll
regsvr32 /s wuweb.dll

Step 3. Save the file to your desktop, using a .bat or .cmd extension.

Step 4. Double-click the icon of the .bat or .cmd file.

Step 5. A command window will open, run the commands, and then close.

The next time you visit the Windows Update site, you should not have any problem 
installing the latest patches.


http://www.windowssecrets.com/2007/09/27/03-Stealth-Windows-update-prevents-XP-repair

Hope this helps

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