Virus

I had a virus that popped up on my computer and i have NOrta Anti Virus. Nortan removed the virus but my computer got messed up and froze for a second and the icon that says Windows has detected a spyware infection is still there. I did a full system scan and it came up with nothing and i restarted my computer and its still there. My computer runs the same and is fine, but the icon is still there.