Originally Posted by
kalniel
No, it has affected all versions of Windows - if you didn't patch in the last two months then you're vulnerable. It's just that there's no patch for XP.
Also, it's a worm, so no need for user error.
The dilemma for the NHS is they have hugely complicated inter-connected systems, presumably on very custom software. Upgrading OS, or even sometimes just running the latest update, is fraught with danger. Catch 22 is so is not upgrading.
This wasn't targetted at NHS either. It's spread worldwide with speed of transmission related to how many computers were active - it looks like Russia/Asia were affected early, along with Europe. Then it hit UK, proliferated in NHS due to size. It also hit the US, but a lucky UK chap found the kill switch before it spread too far that way so vastly limited the damage.