Windows 2008 R2 Unknown error (0x800f0818) solution when installing sp1 patch

There was an unknown error when playing sp1 patch for Windows Server 2008 R2. Details error: 0x800f0818:

Steps to solve the problem after google, refer to: http://www.wikihow.com/Fix-Error-0x800F0818-when-Installing-Service-Pack-1-(Windows-7)

1. Download the system quick upgrade tool corresponding to your operating system: System Update Readiness Tool

Currently: http://www.microsoft.com/en-us/download/confirmation.aspx?id=14668

2, open after download is complete, program automatically detects And patch detection and repair.

3. In this example, enter: %systemroot%\\Logs\\CBS\\, open the CheckSUR file, you can see that an error was found and repaired
< Br>

4, run sp1 again to install, the error is removed.