ITunes error - will not work after trying to update to 7.2, then to 7.3

Question

I have tried to update to both 7.2 and to 7.3, but both updates have failed. Now I am stuck on 7.1 with an error, where my iTunes will not operate and I cannot uninstall because it comes up with the same error that I get when I try to install or uninstall.
Below are links to images of the errors:
Here is the error I have currently:
http://i11.tinypic.com/4qfw4yc.jpg
Here is the error I get when I try to reinstall, update or uninstall:
http://i7.tinypic.com/6he0ft0.jpg
I would appreciate your assistance!

Answer 1

It sounds as though you need this article on trouble installing iTunes:
http://docs.info.apple.com/article.html?artnum=93976
You need the section at the end after "Important: A majority of customers..."
I think you need to do a full removal of iTunes and quciktime with clean up. But the important bit is to clean up the installer files with the MS Installer Clean Up Utility.
If cleanup doesn't seem to work, it is worth checking you have the right version of the Windows installer. If you find it in add remove programs, it should say "Windows Installer 3.1 (KB893803)"