In case anyone else encounters this problem...
Was having trouble with Microsoft updates so they had me download and install their Windows Update Reset Fix It Tool (#50202) to reset some filies on my system running XP Pro SP3.
But installation of the Fix It tool kept failing with the message:
"The installer has encountered an unexpected error installing this package. This may indicate an error with this package. The error code is 2755."
After more than 2 hours on the phone with MS, and when all else failed, I decided to disable ZoneAlarm (v8.0.298.000) and the Fit It installed without further issues.
Too bad it didn't fix my problem with MS updates.