Yeah you can but look at all the new stuff you're missing. A car in 2000 is a lot different then a 2011 car. Same with Windows. From what I hear Windows 7 is pretty good.
And I actually liked Windows XP myself, sure you had all the security issues and constant updates but it worked OK.
Now when I use my wife's four year old computer with XP it's like, Gawd, why is this darn thing so slow! My iMac makes that thing look like an antique.