The account that you set up when installing the OS, although it is an administrator account, actually behaves as a standard limited one. Let me explain. It is actually a hybrid one. Unless otherwise instructed, programs executed within this account run with standard privileges. If a program doesn't run correctly, then you need to right-click and elevate it (Run as administrator). If you are already using an administrator account, then you need to confirm that you want to elevate the program to run with higher privileges; if not, you will need to provide suitable credentials (name and password ofan administrator account).