Because before Microsoft RMS encryption for customer service is a free testing services, although many users but still essentially a kind of "testing services."
Microsoft later this commercialization of the service, need to continue to use the words need to lay this patch
https://support.microsoft.com/en-us/kb/979099
dragged below and find the operating system you are using, and then back " . Download the update package now "
and then go to the page in the" select language: "choose your operating system language, Simplified Chinese word is" Chinese Simplified ".
And then point "download download", wait 30 seconds, or direct point blue "click here Stand-alone here" to start downloading.
Once downloaded install the patch (need to close all of the Office programs when installed), you can solve this problem