Not all computer viruses immediately crash your device in a dramatic display. A virus can run in the background, quietly creeping around on its tip-toes, stealing things and messing things up along the way. If your computer has a virus, here’s what may happen:
- Windows suddenly shuts down.
- Programs automatically start up.
- Some programs won’t start at your command.
- The hard disk can be heard constantly working.
- Things are running awfully slow.
- Spontaneous occurrence of messages.
- The activity light on the
