Help with EmieUserList virus

So I had what claimed to be a google chrome extension that suddenly sprang up on my computer. As it was using an unusually amount of memory and processing power I looked into what my PC was doing and found something was downloading that shouldn't be in a hidden holder with a nonsense path name to a program with a nonsense name that was pretending to be a Google Inc program.

 

I managed to delete the newly downloaded files after Norton power eraser OK'ed a suspicious file and the program stopped running after a reboot.

 

However it has made four changes to my computer that I would like to undo.