So many times i uninstalled and installed old version (like 7.x), even i uninstalled java jdk :). I'm new to this so I apologise in advance if this is a stupid question or has been asked before. “if the program is already running, close it before attempting to run.” After running in task manager process is running ADL.exe and when call it again in a flash builder, next shown info this in the message. ", _ "Already Running", _ MessageBoxButtons.OK, _ MessageBoxIcon.Exclamation) Me.Close() End If : Notes. This process should only be used if the program is unable to be closed through normal procedures such as the Exit or X selections.Next, shut the computer down completely once more, then reboot it. To close a program from the task manager, select the program or app and click End Task. To access the task manager, press CTRL+ Shift+ ESC on your keyboard to review active processes and apps. When this occurs, you can see the "background" copy displayed in Task Manager immediately after closing Drake. The problem is caused by the Windows 8.1 and Windows 10 operating systems, which may hold a program open in the background for a short time after you close it, in a kind of cache, to improve system response times. It is less likely to occur if you regularly close Drake from the Home window using the X button at the top right, rather than closing at the task bar. This problem can occur in any version of Drake running under Windows 8.1 or 10.