Malware Detected

Well, today, for some odd reason, this website is disabling my ability to merely hit the "back" button to go to the previous page. What is happening is there is a website inserting itself in the list and preventing the use of "back." You can see this by right clicking the back button to see the list of previous pages. The last page shown is http://assets.pinterest.com/pidget.html If I simply type that URL into the address window and attmpt to go there, it comes up as a blank page, but it does load. Don't know if it's associated with any malware, but it's a pain in the ass tonight. Doesn't happen every time I come to the PU website, but has been very persistent tonight, off and on.