Some people switching from windows expect OS X to be windows without the viruses. It's much more than that though. Once they see that they can no longer run their favorite Microsoft web-browser, or that there is no start menu, or they notice that the UI is different from Windows.. they freeze up. They're out of their comfort zone. They're used to being pros at using PCs, and now, all the sudden, they have to learn how to use an OS, all over again. Windows has worked for them, and therefore, if one thing doesn't work on a Mac that worked on a PC.. OS X is inferior to windows, in their mind.