For years people in the world of Unix based operating systems have had an advantage over Windows.
They had a setting that was created to make programs ask for permission before they made any significant changes to their computer.
In most versions of Windows, if you were already logged into administrative mode, which most people are, then a program could do anything that it wanted to.
Your computer was just a sitting duck – as soon as you click the button to install, it was fair game.
This was especially true for programs that would install without your knowledge.
In other operating systems this is hard to do since they need you to type in sudo and then your password. But in Windows, since you are logged in as administrator, that program could do whatever it wanted. Basically, NTFS File System is required to protect files and folders from unauthorized access or changes. This helps a lot keeping windows free from any viruses and trojans, spyware, malware, dialer, or other software that can be harmful in many ways. Your user profile might still getting compromised, but not Windows 7 basic operating system in the background. Even your profile got hit, all your pictures, MP3 files or documents can be restored easily by logging in to another account that is not yet compromised.