Have you put the arrow somewhere on the top of your screen and right clicked to see if google toolbar shows? you should see standard buttons/ address bar/links/ lock the toolbars/customise........you may find google tool bar has a check alongside it so unceck it and it will hide it. But to remove it then follow my link
It's easy - you right click next to where it says File Edit View etc and it should have a drop down list of Menu Bar, Status etc and Google will be the bottom one. Unclick it and viola - it's gone !!