Some good advice from the Wall Street Journal:

WSJ's tech columnist Walter Mossberg writes "For consumers and small businesses, the burden of using Microsoft Windows just keeps getting heavier. After growing easier to use for several years, Windows PCs have taken a giant step backward because they are so insecure. Windows is riddled with security flaws, and new ones turn up regularly. It is increasingly susceptible to all kinds of viruses, malicious Trojan horse programs and spyware. As a result, Windows users have been forced to spend more of their time and money supporting their computers. But for consumers and small businesses, there's a simple way out of this endless morass: Buy an Apple Macintosh computer."