Startup Defender is a small program that sits in your Windows tray and constantly monitors the startup locations on your PC. If a program tries to write itself into any startup location Startup Defender will popup windows and ask if the program is allowed to place itself to start automatically with Windows.
Software such as Startup Defender, need to know the amount of memory used before downloading and installed. Went to the author's website and it's not provided there either. Could email them, but this becomes an exercise and probably wouldn't...