Can you upgrade too infrequently? Consider the statement of a senior programmer at a division of Ticketmaster, who told InfoWorld recently that Windows 2000 was just fine, thank you very much. "The Windows 2000 desktop is good for 20 years," the programmer said. "Why upgrade to a new system every two or three years?" I want you to close your eyes for a second and recall the first-generation IBM PC that went on sale 20 years ago. I'm talking about the model 5150, with a 4.77MHz 8088 processor, one 160KB floppy drive, 16KB to 256KB (not MB) of RAM, and a nice green-screen MGA monitor. Now imagine using that box today. Maybe a happy medium between "never upgrade" and "always upgrade" is in order.