hi all when I minimize a window. It is not shown on the taskbar. To maximize the window I have to right click on the task bar and click task manager and the click on the program i want to maximize. what is the problem?

It sounds like you've hidden your task bar. hiding it will also hid whats minimized to it. If the task bar is hidden, it can be unhid by right-clicking, left click properties, untick "Autohide the taskbar".

nope my task bar is not on autohide. When I minimize a window my taskbar is visible at the bottom of my screen but i can't see the window that has been minimize. I have run task manager in order to maximize or to reopen a minimize window.