I think its either the signal strength or the WLAN channel conflicting with your neighbour. ( I assume its the 'cannot connect' from windows)
Home Wifi network working just fine. Password with WPA2-PSK key was set up and working fine at my office desktop with a TP-Link N-router, TL-WR1043ND...and connects OK for my laptop by Wifi. Also works fine with my new TV (smart LG 47LM7600) which I put on the Wifi network, as well as my Sony BluRay player that is also connected by Wifi...and also my new ROKU XD HD player in my bedroom Wifi connection for that TV. Six months ago I bought my wife a laptop and it works fine on the Wifi network on her desk two rooms away from my PC and router. Here's the issue: Several months ago my father-in-law came with his laptop and we set him up with the Wifi password - worked OK till the last day he left. Since then, he cannot log on to the Wifi network. His laptop sees the network, but when he puts in the key (password) it says it cannot connect to the network. I put in the password and it say the same. BTW, my brother-in-law was visiting a month or so ago - same problem...cannot connect to my Wifi network. Father-in-law visiting again for a week and I'd like to have him connected. Any suggestions? Network is fine...just some visiting laptops can't seem to connect. I am certain of my password. Multiple tries don't change anything. To show my father-in-law the password, I started up my laptop (on the wireless network) to show him the actual password. So it's not miss-typing errors. I don't want to reset up the whole home Wifi network with another password. Any ideas? What's the problem when you put in the correct password and some laptops won't connect? Thanks for the attention.