There were no replies to this topic and I have just experienced this - the failure THREE times for I-Tunes to install properly on my brand bnew Windows 7 Acer All in One desktop!
The failure messages include 'Error 7 (Windows Error 193)' and 'C:\Program Files (x86)\Common Files Apple\Apple Application Support\zlibl.dll not designed to run on Windows or customise errors'
So where now please anyone - tried uninstalling & reinstalling THREE times, all without success!