My web browsers all keep getting completely infested with ads any time I run them. I primarily use Chrome, although I have IE installed as well, and that program also has the problem.
I ran Norton 360 and MalwareBytes, and they both removed many things, but my problem persists. In Chrome, I deleted all plugins except native clients, and all extensions, after which I reinstalled AdBlock Plus. I made sure I had no additional tool bars or anything like that. I checked all programs that I know of to make sure that I didn't have anything unnecessary installed.
I am running Windows 8.1