Security Update | How to prevent your computer (PC) from Wanna Cry Ransomware.

Wanna Cry Ransomware Guidelines to stay safe :

• Be careful to click on harmful links in your emails.
• Be wary of visiting unsafe or unreliable sites.
• Never click on a link that you do not trust on a web page or access to Facebook or messaging applications such as WatSab and other applications.
• If you receive a message from your friend with a link, ask him before opening the link to confirm, (infected machines send random messages with links).
• Keep your files backed up regularly and periodically.
• Be aware of fraudulent e-mail messages that use names similar to popular services such as PayePal instead of PayPal or use popular service names without commas or excessive characters.
• Use anti virus and Always make have the last update.
• Make sure your windows have the last update close the gap.

Update 5/15/2017 : 

The entry of the virus to your device, which is dependent on a gap in the Windows system and the gap is present in all types of Windows is that the feature is open.

if you did no't update your windows just turn off SMP,

There are two methods to turn off SMP manually or Tools . 

Manual update procedure

https://goo.gl/VWu0Pc