Are any of you aware of any FREE programs which will kill this thing?

Ad-Aware SE (http://www.download.com/Ad-Aware-SE-Personal-Edition/3000-8022_4-10319876.html?tag=lst-0-2) and Spybot Search and Destroy (http://www.download.com/Spybot-Search-Destroy/3000-8022_4-10289035.html?tag=lst-0-1) should both be able to fix this.

You can also post an HijackThis log here to make sure it, and anything else bad, has been removed. You can get the self-extracting version of HijackThis from here (in line 2): http://www.malwareremoval.com/downloads.html

Here's some info on DyFuCa:
http://www.antivirusworld.com/articles/dyfuca.php

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