Hello Paul,
Sorry to hear that iTunes is not installing on your computer. I found a couple of articles I think may help with the error messages you are seeing.
I recommend starting with these steps:
Remove and reinstall iTunes and AMDS
If the issue continues after restarting AMDS, then you'll need to remove and reinstall AMDS and iTunes.
- Completely uninstall AMDS, iTunes, and all Apple software. Click the appropriate links below for steps:
- Restart the computer.
- Download and install (or reinstall) the latest version of iTunes from www.apple.com/itunes. Installing iTunes will also install AMDS.
- Restart the computer.
- Start iTunes and connect the device. It should be recognized properly in Windows.
You can find the full article here:
How to restart the Apple Mobile Device Service (AMDS) on Windows
http://support.apple.com/kb/ts1567
If you are still getting "Error 7" when trying to do this, I recommend following the steps in this article:
iTunes for Windows: "Error 7" message when opening iTunes
http://support.apple.com/kb/ts3074
Thank you for using Apple Support Communities.
Best,
Sheila M.