Windows XP support ends April 8th, 2014. Surprisingly enough this has been a long run for this operating system. Windows XP was first introduced August 24, 2001. Pretty amazing really. Microsoft wants you to upgrade and this is obvious.
So what does this really mean to you if you still have Windows XP? You have a choice to make and for most, it is not really a dangerous choice. You can do nothing and be pretty safe with what you have. "If it ain't broke, don't fix it" type of answer. However, if you surf the web, download programs, music and other things on the internet, you might be more mindful and realize that your Windows XP will become more vulnerable to hacks, viruses and malware as Microsoft won't be spending any serious time supporting XP any longer. Found bugs won't be fixed, no more security updates, etc. This goes for Office 2003 too.
Here is what Microsoft says about the end of life for Windows XP.
BUT, doing nothing is not a huge risk to most so keeping XP is a valid response.
Kevin Casey. Information Week. Jan 7, 2014