MacMundi

Unfortunately, there's no solution for that. It's that annoying popup window that guarantees your Mac's security.

A popup window appears every time you perform an important operation, like installing software or changing system settings.

Thanks to those insistent popup windows, no one can modify critical configurations of your computer without proper authorization, nor install softwares, and even more important: no application can run without your knowledge. Therefore, those password prompts guarantee your computer's integrity and makes practically impossible the hidden activity of spywares or viruses.

In fact, Mac OS X's security system is so effective that it may have inspired Microsoft to develop a similar system to Windows Vista (I said similar, because on Windows Vista the popup window shows a warning but do not ask for a password), and that feature has certainly contributed to make Windows Vista a much safer operational system than Windows XP.