I can't update my iTunes

I´ve got an iTunes 10.4 for PC and i want to update it to iTunes 10.5 in order to get the iOS5 update. I have successfully downloaded the Setup package, But when it comes to the "updating" comes the trouble.
When the update progress is almost finished, a pop-up window comes out and says something like. "There's been a problem in the update, a missing file is required, please contact the admin"
I've looked for support and i found that the missing file is an .exe from the Apple Software Update folder.
Please help me solve my issue,
Thanks in advance, Juan Pablo from México.

Lightning Strike wrote:
 I'm sure it would work if I uninstalled and reinstalled, but I'd hate to do that because I'd have to reload my whole library. Any recommendations?
Uninstalling and reinstalling iTunes has no affect on your library.
What is the exact wording of the error that keeps displaying?

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