Failed updating definitions for Microsoft System Center 2012 Endpoint Protection

I had this issue on my local computer, after System Center 2012 Endpoint Protection was installed. It appeared to be updating properly, but when manually pressing the update button, it would error out!

The solution:

1. Click Start, click All Programs, click Accessories, and then right-click Command Prompt, and then select Run as administrator.
   
2. In the Command Prompt window, type the following commands and press Enter after each command:
   Cd\
   Cd program files\microsoft security client
   Mpcmdrun –removedefinitions –all
   Exit
   
3. Open Endpoint Protection, click the Update tab, and then click Update.