Use Windows 7, it was patched against this THANKS TO MICROSOFT in March. No thanks to NSA who knew about this but kept it a secret so they could use/abuse the exploit for their own nefarious reasons.
This was one of the reasons why Microsoft was complaining about the NSA keeping these problems secret and not informing Microsoft about them so they could fix them.
I heard people blaming Microsoft, talk about utter STUPIDITY. I asked them, should Microsoft patch DOS as well? If you're still using XP or another version of software that is no longer supported than that is your problem.
This was also an opportunity for Linux fanboys to tout their glorious, perfect OS over Windows, well, except if you press backspace 28 times to bypass the password.
The point is, all software that complex is bound to have issues. The ONLY people effected by this were UNPATCHED systems. If you haven't downloaded and patched your system in over a month, don't blame Microsoft.
Mine was patched in March. And I am not STUPID enough to open ANY email attachments.
I think the reason why this was released in April was due to the fact that Microsoft had just patched it and they wanted to infect as many systems that hadn't applied the patch yet ASAP.