Lightning strike. A lightning strike is an electric discharge between the atmosphere and an earth-bound object. They mostly originate in a cumulonimbus cloud and terminate on the ground, called cloud to ground (CG) lightning.
Virus protection software is designed to prevent viruses, worms and Trojan horses from getting onto a computer as well as remove any malicious software code that has already infected a computer. Most virus protection utilities now bundle anti-spyware and anti-malware capabilities to go along with anti-virus protection.
How to boost your malware defense and protect your PC. Windows Defender is malware protection that is included with and built into Windows 8. This software helps identify and remove viruses, spyware, and other malicious software. Windows Defender runs in the background and notifies you when you need to take specific action.