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.
What is Amazon Go and will it come to the UK? The store without checkouts or queues