Abstract: The paper introduced the concept of the computer viruses and its harm and problems due to virus infection. It introduced the different types of viruses and the evolution of viruses. We discussed the need of anti-virus software and its performance indicators. Detecting viruses and malicious software is a complex problem, for that providing antivirus software is one of the most widely used tools for detecting and stopping viruses and malicious software. We discussed the Cloud Antivirus that uses a powerful combination of virus monitoring technologies to immediately protect your computer from all malware in the cloud computing environment. Finally, the paper put forward prevention recommendations to avoid viruses and malware threats.

Keywords: Computer Virus, Trojan horse, Worm, Malware, Anti-virus, Cloud Computing.