What is MS windows?

I'm assuming you are asking about Windows Vista Features. There is an extensive and thorough discussion on this issue at the "bleeping computer" website, which begins with the following statements: "A Windows Vista feature is simply a set of programs or a particular capability of the operating system that can be enabled or disabled by an administrator. It is important to note that in Windows Vista, when you remove or disable a feature, you are not actually removing files from your hard drive, but rather just deactivating them. Therefore disabling a feature should not be used as a method of freeing up hard drive space. On the other hand, by disabling a feature you may gain an increase in performance due to memory and processor utilization no longer being allocated towards the particular feature." For the full explanation, go to this link: http://www.bleepingcomputer.com/tutorials/tutorial134.html