But I use another tool that is fairly simple to download and set up while going thru the motions on my own computer while I talk them thru on the phone.
The program is a simple one
startupCPL mostly just shutting down lots of hidden things that start when windows does.. including adware and some other malware. surprising how few that appear are needed.
It installs in the control panel but I sometimes keep a shortcut on the desktop while I tweak it.
This alone has allowed me to help people get some speed back, especially older computers.
I tried a couple of remote access appl a few years back but I think the phone line was too slow.
I do think something like that was built into my recent edition of XP and I turned it off. Do you know of that one?