Does your Bt 1800 have a built in modem? If so that's your problem because you do not need to connect it with the USB cable otherwise it's not 'wireless'. I did exactly the same, as soon as I removed the USB cable it worked on both our computers.
Fujitsu Lifebook P727 laptop review
11 best portfolio websites for designers and artists
Office for Mac buying guide: Price, Office 2017 rumours & new features
Comment désactiver les programmes qui s'exécutent au démarrage de Windows 10 ?