Step 1
Click your computer’s “Start” menu. From here, select the “Search” option.
Step 2
Type “*.xml” into the search field (without quotation marks) and press the “Enter” key. “.xml” is the file extension of iTunes library files, and “*” indicates to your computer’s search utility that you want to find any available files with that extension regardless of what they are called.
Step 3
Right-click the appropriate file in the search results and select “Open Containing Folder.” This will open the directory in which the file currently resides in a new Windows Explorer window. From here you can make a note of the directory of the file and either move it back to where it is supposed to be or point iTunes to its new location to restore your library.
yakimeshi 9:40 am on December 16, 2009
Step 1
Click your computer’s “Start” menu. From here, select the “Search” option.
Step 2
Type “*.xml” into the search field (without quotation marks) and press the “Enter” key. “.xml” is the file extension of iTunes library files, and “*” indicates to your computer’s search utility that you want to find any available files with that extension regardless of what they are called.
Step 3
Right-click the appropriate file in the search results and select “Open Containing Folder.” This will open the directory in which the file currently resides in a new Windows Explorer window. From here you can make a note of the directory of the file and either move it back to where it is supposed to be or point iTunes to its new location to restore your library.
http://www.ehow.com/how_5673063_missing-itunes-library.html