I wouldn't think so, Vista usually will have a pop up that warns it will install updates in a certain time and you can choose to delay or to install now. My guess is this box "popped up" while you were playing your game and Vista went ahead and started installing.
If you're worried about a virus you can go ahead and scan with AVG or Malwarebytes again or hit up a free online scanner. I like Panda Activescan pretty well, lately.