I've installed an application that hijacked Chrome's start up page.
I've tried this procedure, then I tried a Windows registry search. I can't get rid of of it.
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Try AdwCleaner (I havent used it for Hao123 though)
AdwCleaner is a program that searches for and deletes Adware, Toolbars, Potentially Unwanted Programs (PUP), and browser Hijackers from your computer. By using AdwCleaner you can easily remove many of these types of programs for a better user experience on your computer and while browsing the web.
Download & Instructions:
It might be more than just your browser's start page; the virus adds itself to the registry and other places. So, better use these steps for cleaning: https://malwaretips.com/blogs/hao-360-cn-removal/
STEP 1: Remove Hao.360.cn redirect with AdwCleaner
STEP 2: Remove Hao.360.cn browse hijacker with Junkware Removal Tool
STEP 3: Clean up the various Windows shortcuts that have been hijacked by Hao.360.cn virus
STEP 4: Remove Hao.360.cn virus with Malwarebytes Anti-Malware Free
STEP 5: Double-check for the “Hao.360.cn” malware with HitmanPro
(Optional) STEP 6: Remove Hao.360.cn from Internet Explorer, Firefox and Google Chrome