posted 06-27-120 06:13 ET (US) <a href="https://nortonsetup-nortoncom.com">norton.com/setup</a> Norton Security Standard can protect only one system. Norton Security Deluxe can be used for up to 5 systems, and Norton Security Premium can protect up to 10 systems. To know more about them and their comparison you can visit the official site of Norton. https://nortonsetup-nortoncom.com