Do you have the SSID turned on in the router ? that can cause difficulties if it cannot be seen , turning it off , as some do , is no help against someone hacking into it , it just causes problems , that would explain why Windows can't find it .
...how it works at your parents house but you can't even detect a known working router. Try disabling all other connections (except for the wireless one) in Network Connections the scan for available netorks. Make sure you are in the same room as the router initially. Good luck.
This thread is now locked and can not be replied to.