Try to uninstall and re-install a Windows Update:
1. Click the Start button and select Control Panel.
2. Click the Programs link.
3. Click the View installed updates link.
4. In the Search Installed Updates field in the upper right corner of the screen, type in KB2957509
5. If found, please select the update and choose Uninstall. Reboot if prompted.
6. If it was found and uninstalled then please download the update Download Security Update for Windows Server 2008 R2 x64 Edition (KB2957509) from Official Microsoft Download Center again and re-install. Reboot if prompted.
7. Report the result.
1. Click the Start button and select Control Panel.
2. Click the Programs link.
3. Click the View installed updates link.
4. In the Search Installed Updates field in the upper right corner of the screen, type in KB2957509
5. If found, please select the update and choose Uninstall. Reboot if prompted.
6. If it was found and uninstalled then please download the update Download Security Update for Windows Server 2008 R2 x64 Edition (KB2957509) from Official Microsoft Download Center again and re-install. Reboot if prompted.
7. Report the result.