Not sure what's going on with the site, is it just me or are other people seeing stuff? http://i.snag.gy/7xLA5.jpg The vevo thing in the notices box. Some little images not loading and the post button is some guy?
...Download Malwarebytes and let it clean your computer. These are most likely PUPs and adware and whatnot.
Yeah that does look like something dodgy installed on your computer. All seems fine here, and I can say with some certainty that we haven't decided to start advertising Vevo.