I can't download iTunes 10.7 for my new iPhone 5

I've tried at least 30 times. I've tried from the iTunes version I already have and from online. It keeps saying "The installer encountered errors before iTunes could be configured. Error occurred during installation. Your system has not been modified." Which gives me no help in knowing what the problem is. I've tried changing my setting on my computer and iTunes, I tried restarting my computer, I even looked for help all over the internet but nothing is helping! And if I can't download iTunes 10.7 then I can't put any music on my iPhone 5.

Maybe you don't. Have enough space

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