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I got a new Webcam, Microsoft LifeCam Cinema, and wanted to record something and edit it. It requires MovieMaker, so I had to install Windows Live Essentials. Every time I tried to install it, however, I would get error 0×80190194 – Now I tried researching a bit on the net, but could find no clear way to get rid of the error.
I got rid of it by opening Internet Explorer, deleting all temporary internet files, going in to “Connections” and removing ALL settings in proxy and dial up connections – They were all inactive, but you have to remove them anyway! Then the install went fine.
If you have any VPN-connections or stuff like that, try to leave them and see of you can install – If not, remove those also.

So if you managed to update to iOS 4.2.1, and you manage your music library manually, you probably think that all your music is gone from your device. It isn’t – Just add or delete one track from iTunes and they will all show up.
Also, you should open up the Photo app to let it update the photo/video library.