help please. How can I remove malware from my computer? I keep getting this pop up Mac Protector it wants to charge me $59.95 to install, I know this is a scam because my computer is also pulling up **** signts

How can I remove this malware virus on my compter. I keep getting this pop up and it says my computer is infected and I need to instal this Mac Protector. It wants to charge me $59.95, i call the MAC store and they said this was fake. I asked how I could remove and they referred me to this website. Can anyone help , it is real annoying I keep getting these **** pop ups too.