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When you install an enterprise certification authority (CA), you must be logged on as a user who is a member of the Enterprise Admins group. This is because certificate templates, along with other required public key infrastructure (PKI) elements, are installed in Active Directory® Domain Services (AD DS) in the Configuration naming context. The following figure shows the specific containers installed in AD DS.

We can disable "user name and initials" pop up prompt for the first time using below script codes. Save this script in ".cmd" format and run it , should not  prompt anymore. If you want to disable for all users , try to save in user log on settings. Reg Add HKCU\Software\Microsoft\Office\12.0\Common\General /v ShownOptIn /t REG_DWORD /d 1 Reg Add HKCU\Software\Microsoft\Office\Common\UserInfo /v Company Reg Add HKCU\Software\Microsoft\Office\Common\UserInfo /v UserName /d "%UserName%" Reg Add HKCU\Software\Microsoft\Office\Common\UserInfo /v UserInitials /d %UserName:`0,1% References:  1. http://www.experts-exchange.com/Software/System_Utilities/Remote_Access/Citrix/Q_27699337.html 2. http://social.technet.microsoft.com/Forums/office/en-US/4a0610ae-e6b9-47ff-a4dd-fef2b7b25074/disabling-please-enter-your-full-name-and-initials-below?forum=officesetupdeployprevious 3. http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Off

Many times, when installing Active Directory Certificate Services they cannot choose to install Enterprise Certification Authority, because it’s unavailable as in following picture: Well, you need to fulfill basic requirements: Server machine has to be a member server (domain joined). You can run an Enterprise CA on the Standard, Enterprise, or Data Center Windows Edition. The difference is the number of ADCS features and components that can be enabled. To get full functionality, you need to run on Enterprise or Data Center Windows Server 2008 /12/R2/ Editions.  In order to install an Enterprise CA, you must be a member of either Enterprise Admins or Domain Admins in the forest root domain (either directly or through a group nesting). If issue still persists, there is probably a problem with getting correct credentials of your account. There are many thing that can cause it (network blockage, domain settings, server configuration, and other issues). In all ca