In the link provided, did you see this response from the OP?
"I contacted Live OneCare tech support and they helped me dig out nine
trojans (on all three network machines) that OneCare let get through. Took
three hrs. The tech told me that it is hard to catch the new trogans. I had
already run Microsoft Windows Malicious Software Removal Tool (KB890830) In
safe mode on one machine. That tool failed to find anything. The tech
advisors at Live OneCare make it worthwhile to subscribe"
May be you should reconsider that, "No,its not a Trojan and its not a DNS changer".