iTunes won't install on my computer, Windows 7 64 bit.

The computer is current on Windows update. I originally had iTunes installed and it worked fine, but would absolutely NOT update-- it would download the first 25.50 MB, then never finish downloading the rest of it, time out, and give me an error message. I just got an iPhone 5, so I can't connect my iPhone to my computer anyway, because it requires iTunes 10.7 to work.

After restarting and trying a variety of fixes to see if I could get it to work, I decided to uninstall iTunes AND ALL OTHER APPLE PRODUCTS, just to be safe, ran a complete hard drive check on both my main and secondary hard drives to make sure there were no errors, and try installing it again from scratch.

But now, the installer will download, but it won't install anything. If I double-click, or right click and hit Run as Administrator, it pulls up a dialog box briefly, then closes out. It will not run. It does not give an error, it just pops up a dialog box then closes without telling me anything. At all. I've deleted it, redownloaded it, restarted, verified that my computer is up to date at least 5 times, and it never, ever, works.

I just ran across another suggested fix that suggested I extract the files and try installing the individual components separately. When I tried doing that, I got this error message:

! C:\Users\Chloe\Downloads\iTunes64Setup.exe: The archive is corrupt

So. What the **** is going on? I am downloading directly from Apple. If I could download the entire ~300+ MB file directly to see if it would work, I would, but I can't find it anywhere. I am really frustrated with how much time this has taken. Otherwise, my computer runs fine.

I've downloaded iTunes on Mozilla Firefox and Google Chrome, I also tried deleting all cookies and temporary internet files in between installations. I've tried a lot of stuff. This is driving me absolutely bonkers.

Thanks for any help you've got.

I'd be happy to share any other computer information that might be pertinent, just ask.