Found it !1!FAQ

Q: How do I prevent downloading bogus files that are actually advertisements?
A: Some servers on the Gnutella network serve advertisements with false filenames to fake popular search results. If you find yourself downloading search results that end up being advertisements, you can stop receiving search results from that host by doing the following:

On Mac, highlight the search result in question by clicking on it. Hold down the apple key and click the mouse. Check "Block Host".
On Windows, right click the search result and "Block Host".
Additionally, you can mark suspicious search results as junk by selecting them and clicking the "Junk" button. If a file has been marked as junk that is a valid search result, it can be marked as "Not Junk". LimeWire will learn over time which search results are valid and filter out the junk results accordingly

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DUN it again!