Operating System Security

Please explain how and why?

The company has the operating system ..... example. Microsoft, Apple ... etc.

The designer of the operating system is primarily responsible. On a per installation, the user or system administrator is responsible for security in each instance of an operating system, they are now.

YOU !!!!! If he came it was bad when the manufacturer of the computer. But its up to you to keep your system updated and running the best anti-virus software.

You are responsible for your own O / S security by updating your computer, keeping a firewall running and using a suitable program of anti-virus and anti-spyware and adware programs.
If talk about the work environment, it is the staff to provide all computer systems with appropriate security.

Before Vista, I think it was the concierge of Microsoft! You have more than 400 patches for XP only, Service Pack 2 was bigger then the operating system XP home! As for the rest of the OS, OS / 2 is the security developers and testers who are responsible for Linux and open source as it is, everybody chips in and therefore it is the most secure because it is made by individuals, and manufacturers are those that flash on the faults of others.