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.
These security programs keep malware from entering your system, quarantine harmful files and remove any malicious programs that do get through. The best way to protect against PC viruses is to update your computer when prompted and to purchase antivirus software that monitors your system 24/7.