This has been recorded on the 45cat site too. This is what someone answered:
This is a browser extension called "I want this" In Explorer, go to tools, manage add ons, toolbars and extentions and disable the "I want this" extension. In Google chrome click on the spanner icon,top right of page go to tools and go through the same process.After you have done this restart your browser and it should be gone. Then go to your control panel and remove/un-install the program " I Want This"
Hope it helps.