|"Anti virus 8" is most definitely bogus (new one). If you clicked on it then you are probably now infested. MalwareBytes, as already given, will likely clear it.|
NEVER click on anything that pops up and says you are infested (don't even close it with the X or use Alt+F4) unless it is your own installed program. There are stacks of these around and they collect info from you and ask a fee. If you see one, you either use Ctrl-Alt-Del and end tasks or power off and restart.
How to know you are getting old 2:
Your feet seem further away from your hands