I take it this only happens to web pages, and not to the My Pictures folder as well... If you're using a firewall, then the content is probably just being blocked, ie. by ad blocking. The missing pictures are probably due to content blocking (dodgy sites?). Norton firewall does this, for example, but you can fine tune how it handles individual sites from the Options menu. Also, make sure your IE settings are not too strict; the defaults are mostly OK.