My 90 year old Mom accidentally downloaded windows 10.. She's nearly blind

[earthshine]

75. A simple way to stop Microsoft from spying on you. (For Win 7/8/10 users.)

The simplest would be to disconnect from the internet permanently.

Since none of us are going to do that, there is this nice little free program that prevents your computer from communicating with any of Microsoft's Telemetry servers. (It sets up the blocking in the Windows hosts file.)

https://www.safer-networking.org/spybot-anti-beacon/

One might need to download fresh versions of this program on a periodic basis because Microsoft continually adds new Telemetry servers. Your usage data (the applications you run, the searches you make, your screen names, etc.) is very valuable to them. After setting up the telemetry in Windows 10, MS backported as much as they could to previous versions of Windows. Win 7/8 became tainted with advanced telemetry functions in June 2015.

Additionally, for Windows 10 users, do not use Cortana, set all your privacy settings as appropriate, and turn off usage of the unique advertising ID.