From the Microsoft Website:
What is end of support?
After 12 years, support for Windows XP ended April 8, 2014. There will be no more security updates or technical support for the Windows XP operating system. It is very important that customers and partners migrate to a modern operating system such as Windows 8.1. Customers moving to a modern operating system will benefit from dramatically enhanced security, broad device choice for a mobile workforce, higher user productivity, and a lower total cost of ownership through improved management capabilities.
What does this mean?
It means you should take action. After April 8, 2014, Microsoft will no longer provide security updates or technical support for Windows XP. Security updates patch vulnerabilities that may be exploited by malware and help keep users and their data safer. PCs running Windows XP after April 8, 2014, should not be considered to be protected, and it is important that you migrate to a current supported operating system – such as Windows 8.1 – so you can receive regular security updates to protect their computer from malicious attacks.
CNS (our computer / network side) continues to repair many systems that are still running XP. Windows 8.1 is really a wonderful operating system. Windows 10 will be out soon...and we can't wait. If you're still running XP, please be careful, the viruses will cost you time, maybe your data.