I was also facing same issue, I tried a lot to fix this however I was not able to do that. At last I just visited http://computervirusremoval.us.com/ and made a call on their toll free. I got instant help for my computer by a certified technician.
unwanted Pop Ups or Ads are some times really annoying, specially when browsing with a phone. Follow this steps to Block Pop-Ups in Android Browser or Chrome:
1. Open the Browser
2. Open "Advanced" Menu
* Note that on Chrome, you need to go to "Content Setting"
3. Mark "Block Pop-ups" button (For Android Default browser, find it under "Page Content" section