This is the Windows shell (desktop, file browser, taskbar etc), closing it is not recommended. This program draws the taskbar and colorful user interface you see while using Windows. If you stop this process the taskbar will disappear, and will likely reboot everything on the desktop.
If you have a Graphics Issue, this would likely be a driver problem. Are you sure you are using the correct driver for your PC? Or should I say that your Graphic Card can support the game?
Check this site as this shows the minimum requirements for the game.http://www.game-debate.com/games/index.php?g_id=7073&game=Age%20Of%20Empires%20II:%20HD