Google and related sites (YouTube, etc; also Facebook) keep redirecting me to Flash Player Pro (even after 3 different a

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Typing in "google.com" or "facebook.com" in my browser (all of them, even on a different device) prompts a pop-up telling me that I need to install Flash Player Pro (which I now know is a virus) and leads to a "download" page. The address in the address bar doesn't change, though.

My homepage is the Google Chrome New Tab page, which usually logs me in to my Gmail account. I did log out through the Chrome settings though (which feels like a mistake now).

I tried to access the sites on my Android phone but the same thing happened (probably because I've synced my settings + account, though it's not automatic).

Please help ASAP.
Thanks
Sorry, I asked this question again because I thought my previous attempts didn't work ;s But I still didn't get a good answer.
The problem is on my computer, though. I dunno how clearing my phone's gonna fix the problem on my computer? ;s