In LW go to Tools > Options > Sharing, if you know where your files were stored you can add the folder from there. The default location is C:\Documents and Settings\"your account name"\Shared.

If you don't know the location do a search of your hdd. From your desktop go to Start > Search > All Files and Folders, type in the name of a song you know you downloaded, and you should be able to find the folder that way. Then add it to your LW library as stated above.

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If it ain't broke, fix it till it is!