Am I running Windows XP?
Microsoft has put up a site that can tell whether you're running Windows XP. This is helpful because it may not be obvious. If you are running Windows XP, then read the following SANS OUCH! article. Microsoft's test site is at http://AmIRunningXP.com
Windows XP is old, and all support for it from Microsoft will soon end. First released more than twelve years ago, Microsoft is scheduled to End of Life (EOL) Windows XP on April 8, 2014. This means Microsoft will no longer release any end-user updates or security patches.
With approximately 25% of the world’s desktop computers still running Windows XP (only Windows 7 is more popular), millions of people will be at greater risk once this happens. Keep in mind, home users are not the only ones who will be impacted as XP is still widely used in offices, industrial control systems, ATM machines, medical systems, point-of-sale terminals, and other devices.
Link to the article for the remainder.