Hi, The little box with the shapes in it is letting you know that you cannot view the web page, as you have already discovered.
One reason can be that the page you are wanting to see is a PDF file and the plug-ins from the Adobe program have been removed from Internet Explorer by simply updating I.E.
When you update I.E. it removes all plug-ins and these must be replaced by re-installing Adobe.
It can also mean that your security/Privacy level setting is too high (blocking required cookies, etc). Go to Tools/ Internet Options/ Privacy and reduce to MEDIUM.
I'm sure someone else will soon give you other reasons for the little box.