Can't uninstall, reinstall, or upgrade itunes

My itunes quit functioning not sure of what version. I think I got everything unistalled off my computer, but every time I try to install the latest version of itunes I get the following message "older version of apple software update can not be removed" I have searched everywhere, even unistalled and reinstalled quicktime - no help.
Any suggestions would be greatly appreciated - thanks in advance - Jim

I uninstalled iTunes and Quicktime, then ran the Windows Installer Cleanup, and did not see anything for iTunes or Quicktime. When I tried to install iTunes again, I had the same problem.
=== Here is the problem ===
I am running Windows XP with all updates installed. I have (3) users sharing a single pc.
I was prompted to upgrade to the latest version of iTunes (7.6.1.9), and now iTunes will only run from (1) user. If you attempt to run iTunes from either of the other two users, the Windows installer starts and attempts to install iTunes. The installer is not able to install iTunes on either of the other two users.
I have attempted to uninstall iTunes and Quicktime (Which appears to be successful). But after re-installing the latest iTunes release, it only works on the original user of the PC.
I have installed the windows install clean-up program to try to clean-up any remaining files from iTunes/Quicktime, and it does not find anything.
When logging on to one of the other (2) users it attempts to install iTunes, but gets a Fatal Error, and does not complete sucessfully. I have even tried adding a new user account, but it does the same thing!
Has anyone experienced this problem, and have any suggestions on what can be done to correct the issue?

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