Download the free version of free SAS, http://www.superantispyware.com/superantispywarefreevspro.html , then update. Check in programs and features for any unfamiliar tool bars etc. and remove. Check chrome's extentions and remove anything unfamiliar. Reboot to safe mode and run a full scan of SAS and delete what it finds. In normal mode open Chrome again to see if ok.
Best Cyber Monday deals 2015 live blog: Best UK Cyber Monday tech deals, sales, discounts & offers