I use windows 8 and mainly use firefox for web browsing and recently when I'm browsing a web page and a pop up box will appear saying "Page cannot be displayed! Update flash player to the latest version." Being a gullible moron I clicked it, geniunely thinking my flash player needed updating. My Nortons however flagged it up as red and so I never completed the download, I thought that would be the end of it. Now every so often the pop up appears and this:
I've also attached the picture just in case.
Is this a virus? and if so how can I get rid of it?
Thanks to anyone who helps.