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Trying to watch cnn online I get sliverlight error 634 error. I can watch espn ok.
Please go to www.xfinitytv.com/computer and copy the information you see on-screen and paste it in this thread so we can further assist you.
For a year I tried repeatedly uninstalling and reinstalling Silverlight manually. Finally, after being pointed to the Netflix site for a similar problem, I used Microsoft's automatic "Fixit" tool, and it worked!
Click on the Fixit icon and watch it uninstall/reinstall Silverlight. Don't know what it does differently than a manual uninstall/reinstall, but it works! WooHoo!