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Use Google Chrome with Force SSL
With its strong sandbox, safe browsing tools, speedy patching and automatic/silent updating Google Chrome is considered the most secure web browser available. Switch to Chrome and install the KB SSL Enforcer extension which will force encrypted browsing wherever possible. The extension automatically detects if a site supports SSL (TLS) and redirects the browser session to that encrypted session.
The importance of back-ups
Get into the habit of automatically saving the contents of your machine to an external hard drive or to a secure online service. Companies like Mozy, Carbonite or iDrive can be used to back up everyone -- from files to music to photos -- or you can simply invest in an external hard drive and routinely back up all the stuff you can't afford to lose. For Windows users, here's a cheat sheet from Microsoft.
Malicious hacker attacks against Java vulnerabilities have exploded over the last two years. If you don't absolutely need it (chances are you don't!), immediately uninstall Java from your machine. Removing Java significantly reduces the attack surface and save you from all these annoying checked-by-default bundles that Sun tries to sneak onto your computer.