On April 8, 2014, Microsoft will stop supporting Windows XP. That means, the resource that monitoring the security issues and creating fixes for this 12-year-old operation system will be allocated somewhere else, inside Microsoft, Symantec, McAfee, and every software company.
Windows XP is a great operating system. No need to argue about that. But the fact is that it was released 12 years ago, and there are so many things changed during this period: The heads of all countries are changed already, including Chávez, Castro, Bush, Putin... Wait, Putin is still the president of Russia, after all these years? That's weird.
Anyway, what I want to say is that technology has been changing A LOT in the last 12 years, so Windows XP is not suitable for this changing world, fundamentally. Everyday there are a lot of resource being applied to secured this outdated operating system, in such a situation that people know how to solve the problem correctly, and the problem is already fixed beautifully in the next version, but we still need to fix this old version in a distorted way, fixing this specific problem without creating new problem in this broken system. It is not fun at all. It is not Microsoft's fault: Nobody can make an operating system that can be used perfectly for 12 years.
Every Windows XP user should upgrade to new operating system: Windows 7, 8, or Linux. Don't ever use XP again after the dead line. Every XP will become an easy target after Microsoft (and other software companies) stop patching it.