Did that myself when I first started out with these programs!!
The quickest way to restore them back to the factory settings is to delete the following file from your Windows User Settings.
VS_Title.dat
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So if you're using XP this file will be found at
C:\Documents and Settings\
Stephen\Application Data\Ulead Systems\Ulead VideoStudio\11.0
Or if you're using Vista it will be found at
C:\Users\
Stephen\AppData\Roaming\Ulead Systems\Ulead VideoStudio\11.0
Change
Stephen to your Windows User Name.