This also works on Windows 8.1.
You have installed the old Task Manager from Windows 7, Windows XP or Windows NT4. But now you find you cannot access the start up programs menu. Because System Configuration (MsConfig) on Windows 8 does not show this as it does in Windows 7.
This is because Microsoft have changed this in Windows 8 and you now have to go to the Windows 8 Task manager to see and manage the start up programs menu. But of course the Windows 7/XP and Windows NT4 Task manager does not have this.
So the way around this is to install the old MsConfig from older versions of Windows. This is the System Configuration from Windows XP which works best on Windows 8 and shows the start up programs the same as Windows 7's one does. And it can run alongside the Windows 8 System Configuration.