[Dyme]

So lately I've noticed this "Extension" that pops up when I try to view a YouTube video. It automatically starts viewing an ad, and then disappears. Under my extensions page, it goes under the name as "Default Extension". When I try to disable and delete it, it never actually goes away. Can anyone help?

What the adware looks like:
Spoiler (Click to View)

Spoiler (Click to View)

[Uriel]

This doesn't happen to me, nor has it ever. Good luck resolving it though :)

[Hemlock]

Strange , try installing adblock plus which is very good if you've never used it and see what happens.

Short of that uninstalling and re-installing chrome should work.