PC and mac
Windows is an operating system developed by Microsoft. Apple makes Macintosh computers that run Apple's own Mac OS X operating system but can also run the Windows operating system.
apple
windows
windows by Microsoft
A Macintosh is a computer. Windows is an operating system. A Macintosh can run the Windows operating system. The question is meaningless.
Microsoft Windows
Windows 7
Mac is a type of computer, and Windows is an operating system that is run on computers. Mac is a line of desktop and notebook computers designed and sold by Apple Inc. Windows is an operating system that is designed and sold by the software manufacturer Microsoft. Macintosh computers primarily run an operating system designed by Apple called OS X. Many different types of computers sold by different companies run Windows.
The operating system that most if not all viruses are made for is Windows. Since Windows was the first operating system built and most people own a Windows operating computer, then won't you think most viruses will target and infect Windows computers? Mac and Unix computers generally won't acquire viruses since not much of them are written for their platforms.
Windows Vista
The faster windows Operating System depends upon what you are planing to install it on. But in the majority of cases, windows Xp is faster on older computers. And Windows 7 is faster on newer computers.
It's called Operating System. Windows Vista, Windows XP, Macintosh, Linux, etc. are called Operating Systems.