I encountered many pop-up ads in my Chrome browser, Internet Explorer browser, and even the browser in Steam. My case just resolved my Chrome browser and Internet Explorer browser. The browser in Steam still a lot of pop-up ads. So I installed 'Malwarebytes Anti-Malware' and 'SUPERAntiSpyware Free Edition' to solve the issue, and it works. 90% of ads pop-up gone in my Steam. I wonder why Norton cannot detect many malware, spyware, spamware and adware, but other product does. I want to upload my scanned log with the two software, so that Norton can update the definition and improve the Norton product.