Here's a problem on a client's Dell laptop (Win XP SP3 MCE2005) that's got me stumped...
Both Internet Explorer and Firefox will not display most of the images on websites. In the majority of cases these are navigation buttons or background page elements. For example, all the buttons along the left edge of the Yahoo! home page are simply displayed as white boxes with blue text inside (see attached pictures).
I've reset IE8, then reinstalled it (also reinstalled Firefox after completely uninstalling it). No change.
I updated Flash and Java to the latest versions, and made sure images were not being blocked in either browser. I temporarily disabled NOD32, and the Windows firewall. I also booted in Safe Mode with networking. Still, no change.
I've seen this issue in Firefox on other machines, and a reinstall fixes it. I haven't seen this with Internet Explorer though.
Another application that's affected, since it makes use of Internet Explorer for some of it's functionality, is Carbonite. When you double click the Carbonite icon in the system tray, all the "button" images are missing too.
Interestingly, however, Safari displays everything fine. Go figure!