Additional browser plugins
VTzilla (Free) -
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VTzilla is a Mozilla Firefox browser plugin that simplifies the process of scanning Internet resources with VirusTotal. It allows you to download files directly with VirusTotal's web application prior to storing them in your PC. Moreover, it will not only scan files, but also URLs.
The scanning options are embedded in Firefox's context menu and download dialog, making the analysis process as easy as clicking a single button.
More Info
LastPass (Free/) -
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LastPass is an online password manager and form filler that makes web browsing easier and more secure.
More details -
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Virtualization:
Sandboxie (Free/Paid) -
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Sandboxie runs your programs in an isolated space which prevents them from making permanent changes to other programs and data in your computer.
More details -
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OR
BufferZone Pro (Free) -
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BufferZone creates an isolated environment called the Virtual Zone. The Virtual Zone "buffers" your PC from all forms of known or unknown attacks that originate from the Internet and external devices. All of your private information is secured in a trusted and separated environment.
More details -
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And because you're an Advanced User :
Extra protection:
EMET 2 (Enhanced Mitigation Experience Toolkit) (Free) -
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EMET provides users with the ability to deploy security features built into Windows to arbitrary applications. This helps prevent vulnerabilities in those applications from successfully being exploited. DEP, SEHOP and ASLR are such security features, if you want to learn more about what they do, you can watch this
video from Microsoft TechCenter. To configure EMET you should follow this
guide by rationallyPARANOID.
Did you buy Look'n'Stop Firewall/Avira Antivir Premium or it's a trail?