The Windows 7 taskbar serves a dual purpose, which can get confusing at times. It’s used to launch programs, and also to switch between programs that are running. So you launch a program by clicking its icon, and also switch to that program after it’s running by clicking its icon.
But what if you want to launch a second instance of the program? Once the program is running, it seems there’s no way to launch a second instance, because when you click its icon, you only switch to the running instance.
There’s a simple fix: If a program is already running and you want to launch a second instance from the taskbar, hold down the Shift key and click the icon. A second instance will launch. You can keep launching new instances this way.