Is there any way I can get some extra security on my computer?

I wanted to know if there was anyway to get extra securiy on my computer, such as passwords and such for certain documents. Someone I know has a diary on her computer and her obnoxious little brother got into it. And I don’t want that happening with mine. Any idea how I can set a password or such to keep prying eyes out of my diary?

Taiwan opposition says computers hacked by Chinese – msnbc.com

“Some of the computers have been planted with Trojan horse viruses so hackers could monitor … Citing the conclusions of a computer security firm, Huang says one source of Chinese attacks was the Kuala Lumpur, Malaysia, bureau of China’s official Xinhua …
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How do I run a virus scan with McAfee security on my computer?

I have windows vista. I have Mcafee security. I just ran a Windows Update for the patch for “Security Update for Internet Explorer” and it says after installing, run a full scan on your system. How do I do that with McAfee?
glad i amuse you, gamer.
thank u 4 your suggestion, Tim Br. The M on has an X over it. I rt clicked as suggested, and there is no scan option. I did check, and McA is enabled.

Does a security camera that uploads to a web server or ftp without a computer exist?

I want to have an always-on motion activated security camera that supports wifi or even wired ethernet that can upload to a web server or ftp. I don’t want to leave my computer on all the time.