Your system is missing a critical Windows security patch (MS12-020) required to gain access to this system

Hi,
I am trying to install VPN Client from my client site. While installing i am facing the below error.
Your system is missing a critical Windows security patch (MS12-020) required to gain access to this system. Use the link below for more information on installation, or open Windows Update and install all available critical updates. When you're finished updating
your system, log out and try again. If you're still having problems, contact your system administrator.
http://support.microsoft.com/kb/2621440
I went through all the related sites but still i did not find any solution. Under Windows installed updates i could see the security update for Microsoft windows (KB2621440). If its already exist why it is not taking this security patch?
Kindly guide.
Best Regards,
Yadav Kankanwadi

Hi,
Based on Microsoft Security Bulletin MS12-020, this security update resolves two privately reported vulnerabilities:
KB2621440 and KB2667402.
http://technet.microsoft.com/en-US/security/bulletin/ms12-020
Thanks!
Andy Altmann
TechNet Community Support

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Your system is missing a critical Windows security patch (MS12-020) required to gain access to this system

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