How can I troubleshoot an iTunes install problem? I'm having a hard time trying to install iTunes on my Windows 7.
After reading some sites like this, this or this, I can`t go further then trying to install, and failing after few seconds, without any meaningful error message.
In some blog I have even found the the command-line switch

iTunes64Setup.exe /l*v c:\log.txt

to generate a log, but it doesn't give me any useful information. And since my wife is getting bored with her iThings that can't be connected to the iTunes, I ask you...
... where can I find more troubleshoot information? Is there some e-mail at Apple that would analyze my .log and help me ?
Edit:

there is no Apple folder in Program Files or Program Files (x86)

there is no Apple software installed in the computer


Edit 2:
The end of the log says:

Property(C): INSTALL_ASUW = 1
Property(C): INSTALL_BONJOUR = 1
=== Log parado: 25/09/2013  21:26:57 ===
MSI (c) (6C:F8) [21:26:57:117]: Note: 1: 1708
MSI (c) (6C:F8) [21:26:57:117]: Transforming table Error.
MSI (c) (6C:F8) [21:26:57:117]: Transforming table Error.
MSI (c) (6C:F8) [21:26:57:117]: Produto: iTunes -- Falha na instalação.
MSI (c) (6C:F8) [21:26:57:117]: O Windows Installer instalou o produto. Nome do Produto: iTunes. Versão do Produto: 11.1.0.126. Idioma do Produto: 1046. Fabricante: Apple Inc.. Status de erro ou êxito da instalação: 1603.
MSI (c) (6C:F8) [21:26:57:133]: Grabbed execution mutex.
MSI (c) (6C:F8) [21:26:57:133]: Cleaning up uninstalled install packages, if any exist
MSI (c) (6C:F8) [21:26:57:133]: MainEngineThread is returning 1603
=== Verbose logging stopped: 25/09/2013  21:26:57 ===

In a free translation: error or exit status of the instalation: 1603
After a long time, problem solved. Was the admin user of the Windows 7 that was corrupted, somehow. Created a new one and everything works.

This way this question got a kind of off-topic, so I'll flag it to be deleted in few days.