Can you supply any more info?
You list 2 operating systems in your profile, vista and XP.....Does this occur with both OS's and also, are you using the same browser and versions on both?
If not, does the issue occur with all browser versions or makes used?
It may also be a connection speed issue if the router were involved, therefore we may have to look at your LAN settings.
Also, does the blank box with a 'red x' appear when the browser is attempting to load images?
Regards