It is very important to know which version of LW you are using.

For LW 5.2 or later, the only files shared are the ones in your Public Shared list. Click on My Files -> Public Shared tab & that will show you. (Any file you do not wish to share, right-click & choose stop sharing.)

As for finding ridiculous search results, that is a kind of auto-spam. Virus thread: Typical virus spam file sizes - Make a note of them (click on blue link to see) & also see How to find music