Open WiFi, another potential problem

So I'm running Ethereal some more this evening while on an unsecured WiFi connection at a Holiday Inn in preparation for both my security and WiFi classes tomorrow. This time I found that one of my neighbors this evening is a bit nosy. Here's a screenshot showing that someone named Robert, using his Dell computer, attempted to access my laptop (TABLETPC2) from across the hotel's network. This screenshot also shows that I've done some things right since his access attempt got him a "STATUS_ACCESS_DENIED" response.