Still having issues with your tagging?

This is a bug which affected many Zune users who updated their Zune Software from v1 to v2 back in the early days. Albums appear incorrectly in the PC library. To fix this, Microsoft released very fast a manual way to do it. But now comes back with a tool to fix it for you automatically...

ZuneMediaCollectionResettoo

Instead of messing with your registry with a great chance of causing problems to your Windows of Zune Software you can this Microsoft tool  to do the job for you: Zune Media Collection Reset Tool .

Source: Zune-Online