Infected and dealing with pops of ad.netcrefer

[mdmpa]

My PC is infected with something and I keep receiving pops from places like ad.netcrefer.net/servecs?atype=p0. I have purchased and run noadware but it didn't do anything. I have run the hijackthis to generate a log file. Can someone tell me what I need to do inorder to get rid of it and also what can I do to keep stuff like this off of my PC? I have AVG Anti-Virus installed on my PC and it is current.

[mdmpa]

I'm realizing that this issue seems to be something that is in IE. If I use Mozilla I don't get the extra pops. It's only when I use IE. The headache is that when I start AIM it automatically starts IE and then I get a bunch of pops immediately from that.