Blank Multiple IE’s

When I’m online, from time to time, blank Internet Explorers keep on popping up on my screen until my computer locks up and I have to shut off my computer. I’ve gone to the Microsoft home page for an update but it keeps on telling me that there’s none available at the time. The URL that comes up when the problem starts is

http://my.netzero.net/s/search?r=autosearch&query=overture
%20monitor%20five%20bids%20NZ20040513C

Now I used to have netzero but I uninstalled it a while ago. I also have Mcafee firewall wall up, running and upto date.