impedence

I recently bought new PC speakers Logitech Z537. When I connect them with PC using included 3.5mm cable then Iget a notification "Your rear line out impedance is equal to or higher than 110 ohms. Enhancement level is set to Extreme ". Speakers are recognized but there is no sound. Sometimes...

I wiped my computer to remove a malware. When i ran a virus scan after the wipe it still found malware. How can the malware still remain after a wipe of the computer?