Seeing that no one else is relpying to your question, I'll offer a possible solution.

You might have downloaded files with "hidden" as an attribute. LW would show them in the library, but by default, windows will not. Although the chances of downloading such weird files are remote, you might as well try this if nothing else is working. Click START>SETTINGS>FOLDER OPTIONS. Under the folder options window, click the "view" tab at the top. Scroll down the checklist until you find a "Hidden files section. Click on "Show All Files" and click OK.

Let us know if it worked. Good luck! :-)