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I hope you have the money, macs usually are twice the price for the same performance. I'm a Windows server admin so I'm a little biased but please hear me out.

Usually the solution is education. You have to learn how to protect your computer from malicious websites/code. Usually you can do it for free. Windows XP/Vista has a software firewall, enable it. Make sure your PC is not plugged directly into your cable modem. Put a router in between to act as a physical firewall. Download Windows Defender (native in Vista or free download for XP). It protects you from spyware/malware. Also use a good AntiVirus app like AVG (which is free). Keep those tools and Windows patches up to date and you won't have too many problems. If you stay off the adult websites and off of myspace/facebook you'll rarely ever have trouble.

I know a lot of folks like myspace/facebook, but people sign up for pages there and fill it with malicious code to take advantage of the site's users.

Malicious code is not isolated to only Windows based OS. Mac/Linux/Unix all have malicious code written for them.