If you are still running Windows 8, it is time to upgrading or be cut off of the last batch of updates. Next week January 12, 2016 will be its last to receive any updates for Windows 8. If you are still running Windows 8, you better think about upgrading to Windows 8.1 or Windows 10.

7. What is the Microsoft Support Lifecycle policy for Windows 8.1?

Windows 8.1 falls under the same lifecycle policy as Windows 8, and will reach end of Mainstream Support on January 9, 2018, and end of Extended Support on January 10, 2023. With the General Availability of Windows 8.1, customers on Windows 8 have 2 years, until January 12, 2016, to move to Windows 8.1 in order to remain supported.
For more details, please see:

https://support.microsoft.com/en-us/...#gp/LifeWinFAQ

http://www.zdnet.com/article/still-r...grade-or-else/