There is also a virus that has been around for a while that attempts to redirect internet connections.

This one (also called Troj/Jet.home) attempts to change your home page to either an Investment Club or a Porn Site. Norton will usually "disable" it, but may leave some associated trash that can cause erratic internet connections.

The "standard look" is for a file called "sp.dll". If it's on your machine - you've probably been attacked by this one, although - especially if Norton or other AV worked - it's considered a "low threat" thing.

It doesn't sound like this one is your problem, but ya gotta' check it all. We found it on one machine a couple of months ago. Norton stopped it, but the trash left behind gave us error messages on boot that it took a while to figure out.

John