We recently had our super hub changed by Virgin and up until then we had several devices which connected to the network. For some reason my wife's laptop is not able to see our wireless network but can see all our neighbours! All other devices see the network and connect with no issue.
I think it is likely that the laptop can't see the n frequency.
When the super hub was changed the engineer changed the channel number from 6 to 13. Do some of the channels broadcast different frequencies? I only say this because at one point the laptop in question was working with the super hub.