Something with your DNS server really sucks. Try this:
Command prompt, run “ipconfig /all”. Write down the IP’s you have listed for “DNS Servers”.
Click Start, right click My Network Places, click properties. Find the connection who’s status is “Connected”, right click on it and go to properties. Find TCP/IP in the list, double click it.
On the “General” tab, at the bottom it will either be select “Obtain DNS automatically” or “used the following”.
Click use the following and put the first DNS IP you wrote down earlier as the prefered, and put this IP in as the alternate: 207.225.209.66
Keep clicking OK until everything is closed. Close any IE windows and try autotrader.com again.
That 207 IP is a free public DNS server that I know can translate images.autotrader.com. I used to have to use it when Adelphia would fuck up their DNS servers.