I am suddenly unable to see images on web pages when using the internet. All I get is a blank space which contains a small square with three different coloured shapes in it in the top left hand corner. I have had this problem before but I cant remember how to sort it out. Please help!

Try to empty your temp. internet files cache.
In IE, click Tools/Internet Options.
Check that your firewall does not stop certain size pictures, considered to be adware.