If you missed the first two parts, please go read them now.
8. Use an active virus scanner and spyware blocker.
There isn't much of an explanation for needed this. In the windows world this is required. On Ubuntu, virus scanners and spyware scanners are not needed due to other measures in place to help prevent infections. However, for Windows, ensure the definitions are updated daily and don't let your scanners expire. You need to stay up to date.
9. Don't click links in emails even if you know the source.
This is true for any OS, but even more so with Windows. In every OS, links in emails can trick you to reveal your passwords and other private data to bad guys. In windows, they can also infect your computer easily. Also watch out for attachments. If you get a file from someone you know, it can still be bad. If it's a video, or a picture ask them to put it on a popular site like youtube, flikr, or facebook. Then go view it there. All it takes is a new virus which infects that type of file to get in their system, then it will be in your system. Using a known third party doesn't eliminate the risk completely, but it reduces the risk.
10. Don't be an administrator.
Many of us share a computer with family. It can be a pain in the butt, but to help keep the bad guys out of the computer give each family member their own account. Make sure your family member is not also an administrator. In fact, it's better if you create a separate account for yourself too which isn't an administrator. When you need to install a new application, switch to the administrator account and run the install. Some applications won't play nicely with this and expect administrator privileges. Really if they can't get these security requirements right, do you expect them to get it right in other ways?
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