One of the projects I worked on for Visual Studio 2012 was the feature Videos that show up both in the Ultimate and Premium start pages AND and in the features themselves.
As you may have noticed the video links in the features give you the option to “Don’t show this again” at which point the the links and text disappear –forever.
If you want to re-watch these videos the easiest way is to just bring up the start page:
View > Start Page
Now if you do demos and want to show your audience what the experience looks like in the feature you you can restore the links by deleting the contents/children of the following registry key
Restarting Visual Studio 2012 you will see the Video links are now back!