hmmmm. okay. i've seen similar sorts of things happen after an iTunesSetup.exe (installer) file was saved over top of an iTunes.exe (program) file. that usually used to cause an "a later version of itunes is already installed ..." message, though.
let's start the treatment protocols for that set of problems. not being connected to the internet is going to introduce a bit of complexity into the procedures.
preliminaries
on a PC connected to the internet, download and save to the hard disk a fresh copy of the itunes installer, and the installer file for the Windows Installer CleanUp utility:
iTunes 6.0.3.5 Installer
Description of the Windows Installer CleanUp Utility
while we're at it, let's get a copy of the standalone QT 7.0.4 installer (it might come in handy if we run into complications later on):
Quicktime 7.0.4 Standalone Installer
burn the installers to a CD-R (or copy them to an ExHD) and carry them back to the PC. when it comes time to do the installs, copy them to the internal HD on the PC first(rather than running the installs from the ExHD or CD-R).
treatment
we're first going to completely uninstall the existing itunes and QT from that PC, and also make sure we've cleared away any leftover installation configuration information.
use the complete uninstall instructions from this document to get rid of your existing itunes and quicktime:
Troubleshooting iTunes, iPod Software, and QuickTime installation on Windows
if your Add/Remove programs doesn't let you uninstall either itunes or quicktime, install and use the Installer Cleanup utility to clear the existing installation configuration information for the programs and then use the complete uninstallation instructions as a guide to a manual removal of leftover program files and folders.
even if you
don't run into problems on the complete uninstall, install and run Installer Cleanup to check for any leftover itunes or quicktime installation configuration information (after the uninstall). remove any that you find.
once everything has been cleaned out of the way, run the itunes install using the fresh installer.
does that install go through without the 1606? (if we get it again, there's another treatment we'll try.)
if it goes through okay, will itunes launch properly this time?
love, b