When you click on search, there is a tab on the top right, just under where you type in what you are searching for that is called "Advanced Search". Expand this and select which drive/folders to search through.
Primary: Ed's Apfelwine
Secondary: Scottish Ale,
Aging: Blueberry mead, Blackberry mead.
Drinking: Brown Ale, Saint Arnold Divine Reserve #5 - Russian Imperial Stout. :P