DNS Malware/Errors in Lion

Recently my computer has been having DNS errors in Chrome, Firefox and Safari.  At first I thought it was an error or virus associated with my router, but I've discovered it must be native to my computer as I've recently moved.  I've done searches using ClamXav that have come up virus-less, and clearing the DNS using terminal command
sudo killall -HUP mDNSResponder
seems to work temporarily.  The more I browse an encrypted website over the course of an afternoon, the more likely it is that I will encounter an error either preventing it to load, or loading a totally different website (for example a Yahoo forum instead of google.com).
Is this a virus/malware or an independant software error?  How should I resolve this?

This is the only DNS malware, but I don't know that it's even functioning.
For the DNS Changer malware see the following:
Will your internet service cut off on July 9?
DCWG | DNS Changer Working Group
How to remove the DNS Changer malware

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    For the DNS Changer malware see the following:
    Will your internet service cut off on July 9?
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