It sounds like you've gotten the dreaded "69.20.16.183 ieautosearch" look2me variant that is a real bitch to remove. It made it's way into the wild around November 28'th and so-far none of the removers have been working on it yet. I worked on it for about 9 hours yesterday with no luck. Ad-aware released a new update today so I'm hoping that may take care of it. If not the only way right now is to format and start over. But I would wait for a few more days to see if spybot or adaware comes out with something.
If you run hijack this and you see something like this
O1 - Hosts: 69.20.16.183 search.netscape.com
O1 - Hosts: 69.20.16.183 ieautosearch
O1 - Hosts: 69.20.16.183 ieautosearch
O1 - Hosts: 69.20.16.183 ieautosearch
O1 - Hosts: 69.20.16.183 auto.search.msn.com
Then you have it and your pissing in the wind trying to get rid of it. Because every time you clean your host file this damn thing will put it back and will not let you read only protect your host file. It has so many hooks in the registry and dozens of files all over your hard drive that it's prove to be impossible to find them all.
If this is what you have then shoot me an e-mail and I'll give you a hand removing it once I get if off the
other computer I'm working on.
[email protected] or clachance at gt dot rr dot com if you don't want to send to g-mail