Security Certificates contain information about who it belongs to, who it was issued by, a unique serial number or other unique identification, valid dates, and an encrypted fingerprint that can be used to verify the contents of the certificate. In order for an SSL connection to be created both sides must have a valid Security Certificate. Your most likely place to get viruses is from disks that people loan you or that a child uses at school or on someone else's computer and then brings home to use in your computer. Even data disks can carry viruses from one computer to another. The virus checker software needs to be updated about every 3 to 4 months to take care of any new viruses.
Some computer users keep a virus checker actively running at all times on their computer.
You need to print Tips of the Trade and make a notebook of the tips to study and refer to. This software is the most common operating system for servers on the Internet. This software runs underneath other kinds of software such as word processors and spreadsheets. The most common way to use a URL is to enter into a WWW browser program, such as Microsoft Internet Explorer, Netscape, or Lynx. No, I don't know how it gets broken or how to prevent the phenomena.