Installed flash player from website, now getting pop-up ads Safari upda, now getting pop-up ads

About a week ago, we accidentally installed what we think is a bad version of a flash player when attempting to register a rewards card. We un-installed the software as soon as we realized it was not the correct website for the rewards card. Since then, we are getting a flashing pop-up ad in the right column of the browser as well as a video window that pops-up from left bottom of browser and then multiple windows in Safari will just open. Any idea if its adware or malware and how to get rid of it?