Computer issue

That technician was clearly in the wrong but I can't help a niggling suspicion that Comcast encourages their staff to do that. Might be worth asking it directly, the leading question, why did its employee wipe Linux and install Windows without the owner's permission?

Be prepared to write a letter to as high a manager as you can find in the company - the "contact" details on most big company web-sites, if given at all, are there to protect the company from awkward questions. And add, "I look forwards to a full explanation for his actions and your policy regarding customers' software, by return."

It might still ignore you, but if a second letter also asking why the first was ignored, also draws a blank; write a third this time clearly labelled "cc: ... Police", local Press or whoever else - and do indeed do that.

Really though, even with what you have done to help her, I think you need a long hard talk with your mother about whether she should be using a computer at all, if she refuses to take even the most basic security precautions.

If he wiped that hard drive completely clean, if you had a backup you might be able to load that in, if not, my go-to would be to just reinstall Linux. Since Windows and Linux don't talk to each other, you can't go in to Windows and do a restore.

Even if you had imaged the hard drive when Linux was on it, you could just reload up that image and it would probably put you right back where you were at with Linux. But my go-to is just wipe, reinstall. I know it takes time doing it that way, but to me, it's a completely fail safe method.

Linux for an 80 year old Mom? Why the hell are you doing that to her? Cuz its free?

These techs that work for Comcast don't know Linux, they don't know much other than to follow a flow chart to solve issues.

He likely told her he couldn't support her issue on Linux, but could support it on Windows.

Did you ask her if she gave permission to reimage her PC?

Windows OS isn’t free. Did he charge her to install it? If so there is your documentation. Depending on your level of experience kali Linux has some very strong tools for recovery. A personal favorite is photorec remarkable level of recovery

I figured that. I need evidence to have this person arrested. Since he errased it i have nothing. I wrote a letter to comcast corporate. Matbe i can get this guy fired.