Update mac os x 10.7 change system preference?

Hello,
I am a new Mac user. My Mac is os x lion 10.7. I was recently afraid of being infected with trojan and thus, I erased all the hard drive (7 passes) and then re-installed Mac os x. I set administrative password to access items with lock icon in system preference (like sharing, etc). However, after I installed the updates for Mac os x (update directly when clicking software update), I turned on my Mac and see that my setting for system preferences changed and the box "require an administrative password for item with lock icon" was unchecked (I was sure that I checked this box before).
I do not know whether the update for Mac Os x did that change or the spyware/trojan is still in my Mac and made the change to make my Mac vulnerable?
In addition, I set require administrative password to install any software or applications. However, when I clicked on "software update" from the apple icon to get updates, the updates installed without asking me for password. Is this strange and what should I do to set password for anything that need to install in my Mac.
I really appreciate your help. Thanks a lot.

There are no known viruses for Mac OS X. The system has built-in anti trojan/spyware. In short, you need to ignore a lot of warnings and just about invite it in.
i'd re-install Lion again and leave System Preferences alone. You can do an install "in place". It shouldn't effect any of your data. That said, you should always have a good backup.

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edited by: cs

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BUICKWILSON,
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Update mac os x 10.7 change system preference?

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