Any addons installed in chrome (as I can see that you're logged in and google normally reinstalls and addons and restores your bookmarks and such, and one of those could be compromised)?
Also check your default homepage if this is coming up the moment chrome is started as it might have been changed before the reinstall or could have come from anything else.
Also, is that coming up at start or after you visit a site (since I see on ad blocker installed and adverts are one source for triggering these redirects to fake virus warning sites)?