New
#1
One method: the 3-finger salute, Ctrl+Alt+Del, or right-click the Taskbar to open Task Manager, check the Startup tab to check if there, right-click the Enable and Disable it.
It's Steam Chat, I've just got it as part of the latest update from steam
He must have Steam installed to be getting that.
Sorry sheltieuk, I thought you were asking the question. My bad.
It's a Steam Chat Client, he has to have Steam installed. It just started the auto pop up with a Steam update.