WDS 3.01 Won't install at all

Running XP SP2 and recently installed Office 2007 (haven't uninstalled
office 2003 yet). Outlook 2007 wants the WDS application for instant search.

I downloaded 3.01 and ran the install. It extracted all the files and went
about a fifth of the way through the process (according to the progress
bars) and then stopped. After about a minute it reported "Necessary update
failed to install. Refer to C:\Windows|KB17013.log."

Looking at the log file indicates installation failed because: INF_REGISTRY
Failed

Another log file created at the same time" KB915800" states Setup
encountered an error: The update.ver file is not correct."

I tried installing using the MSI file rather than the EXE.

I then tried installing version 2.66 (I think that's the correct version
number -- it's the most recent one previous to 3.01 available on Microsoft's
site), and it installs Fine.

I then thought I could update and then installing 3.01 over 2.66.

No such luck, Failed, same error.

Now I don't have WDS installed at all.

I can live without it, but since Outlook wants it, I'd like to install if
possible.

Any suggestions?