PCs require someone more tech-savvy who is willing to maintain their machine. A (Windows) PC is like a car - you've got to change the oil, air up the tires now and then, rotate the tires, replace brake pads, etc. Most of the problems with Windows stem from people too lazy to keep their shit in order and defrag their hard disk now and then.
One thing that irritates me beyond belief about Macs is that they create all these invisible files everywhere. For example, I keep "Show hidden files" active on my machine so I can see some system files I like to have access to. But when I go to our private network drive, it's riddled with hidden files created every time the Mac opens a file. It's incredibly obnoxious.
That and the file navigator thing (a column per level of depth), I much prefer the Windows directory tree structure.