Your neighbor has seemingly networked your computers. As you can see by the error, he has disabled you from looking into his system but not vice versa.
Nope i got a NETGEAR ROUTER thats not wireless. anyway can he go threw any of my files.. Because I gave him my comp for 1 day to put some ram in side od it so i dont know if he trying to be sneaky and like steal some stuff or anything like that.. Is this bad or is it just harmless?