If you're still using a PC running Windows XP, give that PC a birthday hug! It's 10 years old! (OK, the PC may not be 10 years old, but the operating system is). It's hard to imagine using any piece of computing equipment for 10 years. These days, computers are lucky if they last 3 years before getting replaced with an updated system.
Most of my computers are running Windows 7. I have one running Vista and a few that have dual-boot options so that I can run XP. However, none of my main machines are running XP at this point.
Computers running XP were sold in retail settings through 2010.
I bet your hospital still has many computers running Windows XP.