OK, your computer is infected with an adware or potentially unwanted program (PUP). Let’s start cleaning out.
I suggests use AdwCleaner + JRT + Malwarebytes Anti-malware. These apps are free. Links below:
AdwCleaner by Xplode from http://www.myantispyware.com/download/adwcleaner
JRT (Junkware Removal Tool) http://www.myantispyware.com/download/jrt
MalwareBytes Anti-Malware from http://www.myantispyware.com/download/malwarebytes-anti-malware
It is the safest practice to disconnect the infected computer from the Internet, ONLY connect it to Internet to download cleanup software or if called, updates for the cleanup tools we are using. Otherwise, keep it disconnected!
Close all open programs. Double click on AdwCleaner, then select I agree if it appears. Click Scan. When the scan of your system has completed. Click on Clean button.
Run JRT and allow the program time to run.
Run mbam-setup to start the installation of Anti-Malware. It will open the Anti-Malware Setup Wizard. Follow the prompts. When the installation is done, click to Scan now to perform a system scan. When the scan has completed, click on the Remove Selected button.
If they cant get rid of the pop-ads (in some cases that does happen) then reset Chrome settings to default state (look the steps http://www.myantispyware.com/2016/01/06/how-to-reset-google-chrome-settings-to-default/)