If you mean the videos folder, which is a green (hence virtual) folder under your username, I would suggest making a folder of that name in the same location and then use the registry to make it the default folder once more by pointing it to that folder.
More details on moving such folders, and where their keys are located (so you can create/edit them to hopefully restore the folder) here:
http://www.winhelponline.com/articles/95/1/
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