Look at Here: Several Steps to protect Your computer in Diablo 3

Players of diablo 3 are long desiring for their computers being protected from malicious programs like "keyloggers". We know that this kind of program is pretty serious and it can snag information directly from your computer by controlling your keystrokes or by gaining access to important applications such as your clipboard. And if it's about your in-game items and also diablo 3 gold, you need to be very cautious. Here is to provide several tips for you.
1. You need to install anti-spyware and antivirus software.
2. You need to keep your operating system up-to-date.
If you're using Mac, you can check for software updates at Apple.com; and if you are a Windows user, you can check the most current updates anytime by clicking Windows Update in the Start menu, or by visiting the Microsoft Windows Update page.
3. You need to keep your browser and browser plug-ins up-to-date.
You will want to make your web browser as up-to-date as possible as with your operating system and your anti-malware software. Browser can not only provide more functionality and tools, it can also include a more comprehensive phishing filter and new security definitions.
It is very important for you to use the most current versions of your browser plug-ins and application, such as Adobe reader and adobe flash player, and check for security updates regularly. That is because they may sometimes be targets for certain types of malware. Many plug-ins and applications will prompt you to update automatically, however, you should still check the distributor websites to make sure you are using the most recent versions.