Macs can crash, too. Assuming you've got your system in a stable configuration, you're using a decent and stable version of Windows (such as Windows 2000), and you don't pile a lot of crap software onto the system, then a Windows box can be just as stable as a Mac.

I've got a close friend who uses and supports both PCs and Macs for his company's high-end audio editing software, and he says that a properly-configured windows computer is no more crash prone than his mac systems in his experience.

Of course, for his main audio-editing work, he uses a Mac by choice...