Put your mouse over (do NOT click) the program in the Task Bar until the preview appears directly above it
Right Click on the preview and select MAXIMIZE
If the program appears full screen, then it is running but is just not visible to you. Click RESTORE and try both of the options above again.
OR
Put your mouse over (do NOT click) the program in the Task Bar until the preview appears directly above it
Right Click on the preview and select SIZE or MOVE
If the “Move” option is greyed-out, you’ll need to select “Restore” first. Once restore is selected, you should be able to move the window.
After you open the program and find it's not showing anywhere but the taskbar, press WindowsLogo+Shift+LeftArrow to bring it back into view.
OR
Hold down SHIFT key and right click on a running program icon on the taskbar, a popup menu should appear, click on Move then use the Left/Right Arrow key to move it.