My Windows Update was stuck at 0% downloading for about a month.  I fixed it after the WannaCry virus news on Friday by doing the following:

1. Stop the Windows Update Service
2. Delete C:\Windows\SoftwareDistribution\DataStore\DataStore.edb
3. Start the Windows Update Service
4. Check for updates

After that it was working fine!

As for how it got stuck in the first place... I killed the service when it started downloading and taking all my bandwidth while I was playing a game online.  Then I held a grudge against the service for a month and left it broken to teach it a lesson.
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