|Probably references left in the registry but its a matter of exactly what you should be looking for. Most likely place:|
Another (less likely) place is the same path in:
Maybe something like MalwareBytes will find and delete them if you don't fancy diving into the registry. Otherwise, see if anything suspicious appears in the Startup tab when you type msconfig in the Run box. If so untick the entries, which is a crude workaround.
Long Range Golfer