A privilege escalation vulnerability was found in Microsoft Windows. By exploiting this vulnerability malicious users can execute arbitrary code in kernel mode. This vulnerability can be exploited via a specially crafted application.
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)