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My first download was form DDL, and as I said it gave me an incomplete (but yet working) ISO of about 680 MBytes, more or less.

Hopefully when you said CD, you meant DVD.  I will assume that you did.

Nnnnnnope, I really meant CD because the image file I got was Cd-sized... so I discovered it was currupted (but the download ended without problem... strange things happens).
I downloaded the iso again (this time with torrent) and now I got no problem with the installation! Thanks for your advices!

Hi, unfortunately I have the same issue ("Error 2834. The next pointers on the dialog SetupError do not form a single loop.")
I tried everything you listed (run as administrator, do the cleaning with CCleaner, burn the cd, disable my antivirus) plus I tried to run directly the .msi installer and to run the setup in compatibility mode (XPSP3), but nothing worked.  :'(
Any idea ? Here my system:

Windows 7 Ultimate x64
Cpu i7 Q720
8 Gb ram DDR3
About 100 Gb free space on hdd.