I am an advanced user, using Windows 7 with Avast! antivirus running. Today I started browsing and faced some weird popup. Upon investigation I found that "Relevant Knowledge" was running in my system.
I was able to uninstall it using the Programs Manager and deleted the file's entries in the registry, but I am a little troubled due to the fact that Avast! was not able to detect it; and secondly, how it came into my system.
Also, what further prevention measures should I take?