ads from another site on my youtube videos?

[Rimundo]

First if it only happens on your laptop and on none of your other computers then it may be something you possibly installed with a program without knowing. This happens a lot with freeware programs that are supported by ads. It could also be something you accidentally installed in your browser without knowing. These two can be solved by installing any recent software you installed. But the most likely possibility is that it is an ad that was put there intentionally by someone and they are trying to get you to click the add so that they get money. If it's this step then the only thing I can tell you is either deal with it, or find a ad blocker that works with Chrome.