We each have our own wifi connections at home - smartphone hotspot to share 3G/4G internet. Recently, I installed Windows 10 on my sister's laptop - first Win 7, then upgrade to Win 10 to get the digital entitlement (still working, btw). During this process, I had used my own internet connection. Now, despite my best efforts, my sister's laptop keeps defaulting to using my internet connection. I have tried using 'forget this network' in settings. I have used REGEDIT on her laptop and deleted my hotspot's saved key from HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkList\Profiles. All to no avail - it keeps using my bandwidth. Short of doing a clean install and using her own hotspot to set it up this time, is there anything else I can do? She is having to enter her wifi password every time she manually connects to her own hotspot.