Wireless links and the neighbor
Log into your router (manual should tell you how) and you should be able to browse to a screen which list currently logged on computers. Check when your neighbour is home to see if he is abusing your hospitality.
Second, do all the security that has been suggested on this forum, they are not that hard. I knew nothing about wireless 2 weeks ago until I had to set one up and then a couple of hours on the internet and I know all about SSID's, broadcasting, WEP etc. At a minimum stop broadcasting, then change your SSID to something hard and if everything is working ok investigate WEP. Do one thing at a time and confirm it still works so that you know what to troubleshoot if it doesn't. Remember that each time you make a change on your router that you need to make a corresponding change in your network properties (control panel, network).
Only an experienced hacker will get in then and they have to know where you are. Simple and probably 95% more secure than nothing. Also there are websites dedicated to most routers that step through doing this stuff, just do a search.
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