First guess; the BIOS.
Second guess; the CPU.
System menu
There are various commands associated with computer window that is: Run (Win+R), Windows Explorer (Win+E), Show Desktop (Win+D), Search (Win+F) Locked (Win+L)
window bar
task pane
Ribbon
Task pane.
task bar
An area at the top of an office program window that contains commands for working with the open file; the commands are organized under tabs
window
On a Windows machine it's typically called "My Computer".
A window
ewan
Typically (at least in Windows OS), that will at least consist of the Title Bar and (in most cases) the icons to Minimize, Maximize, Restore and/or Close the window.