My old USB adapter broke so I bought a new one, the Netgear A6100. It recognizes the wifi in the house but won't connect at all. I moved the router into my room and the adapter into my grandpa's PC but the same thing was happening. I left the adapter in and moved the router back into the room with with my grandpa's PC and it connected. As soon as I moved it away from the router it stopped connecting to the signal. I have tried installing and uninstalling the drivers countless times to no avail. I've reset the router a few times too. OS on both computers is Windows 7 Home Premium.
EDIT: The distance between the two rooms is 40 or so feet, between two walls. Should be well within the range of the adapter. (and it recognizes the signal, regardless)