Real-time protection is ok.Do you use any special settings?
Additional On-demand scanners:
Emsisoft Emergency Kit (Free) -
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With the Emsisoft Emergency Kit Scanner you have got the powerful Emsisoft Scanner including graphical user interface. Search the infected PC for Viruses, Trojans, Spyware, Adware, Worms, Dialers, Keyloggers and other malign programs.
Run the Emsisoft Emergency Kit Scanner with a double click on a2emergencykit.exe. Found Malware can be moved to quarantine or finally deleted.
Additional browser protection:
WOT (Free) -
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To help you avoid malicious sites you can use Web of Trust (WOT) a website rating browser plugin. After you add it to your browser make sure you only visit websites rated "Green" by WOT
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
Extra protection :
Norton DNS (Free) -
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It automatically blocks dangerous Web sites so you can surf the Web without worrying about getting infected or scammed.
Norton DNS - a safer and smarter way to surf the Web.