You can click on the "Size" column header in your search so it lists the largest files first, then all those little spam/virus files will be at the bottom of the list.

You can also filter the search results by file types. Say if all the affending files are wma. and wmv. you can go in LW Tools>Options>Filters>Keywords>add the file extensions and hit apply.

Or you could block the host of all the bad files by right clicking on the file in the search results then click "block host", but I think that is the least effective because they keep comming out with different ip address.

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