At some point, something I did on my XP Home Edition computer caused
AuthentiCode to break.  Since I was still busy installing and configuring
the computer, I am unable to track exactly what broke it.

The symptoms I am getting are as follows:  WindowsUpdate fails, stating that
"Your Internet Explorer security settings may be set too high".  Changing
the security settings as per Q174360 does not have any effect.  The
following entries appear in "Windows Update.log" every time I attempt to run
Windows Update:

2002-08-31 16:47:52  14:47:52   Success   IUCTL          Starting
2002-08-31 16:48:18  14:48:18   Error     IUCTL          Digital Signatures
on file C:\Program Files\WindowsUpdate\V4\temp\iuident.cab are not trusted
(Error 0x80096001: A system-level error occurred while verifying trust.)
2002-08-31 16:48:18  14:48:18   Error     IUCTL          Digital Signatures
on file C:\Program Files\WindowsUpdate\V4\temp\iuident.cab are not trusted
(Error 0x800B0004: The subject is not trusted for the specified action.)
2002-08-31 16:48:18  14:48:18   Error     IUCTL          Failed to download
iuident.cab from http://windowsupdate.microsoft.com/v4/ to C:\Program
Files\WindowsUpdate\V4\temp (Error 0x800B0004: The subject is not trusted
for the specified action.)
2002-08-31 16:48:18  14:48:18   Success   IUENGINE       Starting
2002-08-31 16:48:21  14:48:21   Success   IUENGINE       Shutting down

Further, if I go into Internet Explorer and view any of the trusted root
authorities' certificate, I get the same error message:  "A system-level
error occured while verifying trust."

I have searched through quite a few newsgroups and web sites, but have not
been able to find a way around this.  The only item I have found that held
any promise was re-installing Internet Explorer (there are published steps
available for accomplishing this on XP) but this did not solve the problem
either.

Does anyone have any idea on how to fix Authenticode so I can use
WindowsUpdate?  Would appreciate any constructive feedback.