I have an Oficejet 4500 G510-n printer with Windows 7 OS. The printer is connected by an USB connection.
The printer works fine in general. From time to time, while looking at a site in Internet Explorer, the printer prints the contents of the site without any action taken by me. Some times the printer prints one page, containing "Page 1 of 1" at the top of the page, and "about:blank" at the bottom of tha page.
I did not find any regularity of this phenomenon.