I finally found my Zune after missing it for nearly a year and immediately tried to reinstall the Zune software on my computer. This has been spectacularly more difficult than I remember it being. Using Windows 7 I have tried installing it without any firewalls, as an administrator, using the complete Zune software package. I'm kinda at a loss here as to what to do and Microsoft's solutions have been even more useless than I would have expected.
Edit: Also relevant I get error code: 0x80070424.
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That is to say, I believe even if your account is an administrator, you still have to right click and install as administrator, also try disabling UAC by punching it in the face, with a gun of some kind
In short, Microsoft makes a huge download that contains every bit of software that the Zune software is dependent on, found here. Installing this should fix the problem. I remember having this issue a while back as well.
This is what I've been using and so far it's been no luck.
Right clicking and running as administrator didn't do the trick either.
https://twitter.com/#!/zunesupport