Computer Performance

• When a computer is infected with viruses and other malware, its performance suffers. Malware uses up vital system resources and precious storage space, and it can sometimes prevent you from connecting to the Internet. Running your antivirus software on a regular basis not only cleans any infection from your computer, but it also proactively protects your system against these malicious programs.
  
  

Personal Data

• Many people use a computer to check email, pay bills, check their bank accounts and store personal and family information. Certain types of malware can actually scan your computer for certain files and send them back to the attacker's computer, where they can be used in identity theft or even to break into your accounts. Other types of malware can record keystrokes. These records are then sent off to the attacker, who can use the information to log into your banking or shopping accounts.
  
  

Using Your Computer for Illegal Activity

• Some viruses actually allow another computer to take control of your computer. When this happens, the infected computer is referred to as a zombie. Zombies can be used to launch attacks against corporate networks or websites to disrupt service. They can also be used to store illegal copies of music and movies. Some are even used to store materials like pornography or other files.
  
  

Best Practices

• Computers need antivirus protection, but more importantly, they need good antivirus protection. When choosing a solution, make sure that it is a legitimate program. One of the most common attacks used by cybercriminals is to trick an unsuspecting user into thinking his computer is infected. The victim is then routed to a website offering antivirus protection. Unfortunately, this software is all part of the scam. You can check to see if your antivirus software is legitimate by visiting a site like AV-Comparatives.
  
  Anitvirus software also needs to be current. Unless virus definitions (or signature files) are updated, your antivirus software may not be protecting your computer against all known threats.