I've had similar problems. If you installed the firmware on that Zune from that computer you cannot unlink it for some reason. I haven't tried this but one solution I thougt of would be to go to another computer and link it to that computer, then take it home, and hopefully it should give you the guest option. The solution I know that works, I found by accident. I needed to reinstall Windows on my computer. I formatted the hard-drive and reinstalled a fresh copy of windows, went to connect my Zune, and viola I'm now a guest. That is a lot of effort to go through though.
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