Two "NTDS.dit" file available on a Domain Controller !!

            Active Directory data is stored in the Ntds.dit ESE database file. Two copies of Ntds.dit are present in separate locations on a given domain controller:

%SystemRoot%\NTDS\Ntds.dit    This file stores the database that is in use on the domain controller. It contains the values for the domain and a replica of the values for the forest (the Configuration container data).

%SystemRoot%\System32\Ntds.dit    This file is the distribution copy of the default directory that is used when you promote a Windows 2000 – based computer to a domain controller. The availability of this file allows you to run the Active Directory Installation Wizard (Dcpromo.exe) without your having to use the Windows 2000 Server operating system CD. During the promotion process, Ntds.dit is copied from the %SystemRoot%\System32 directory into the %SystemRoot%\NTDS directory. Active Directory is then started from this new copy of the file, and replication updates the file from other domain controllers.

Tool to get rid of unwanted software's which shows "Access Denied" while removal

Revo Uninstaller Pro

Revo Uninstaller Pro helps you to uninstall software and remove unwanted programs installed on your computer even if you have problems uninstalling and cannot uninstall them from "Windows Programs and Features (Add or Remove Programs)" control panel applet.

Even delete folders which prompts "Access is denied" (Having appropriate permissions).

http://www.revouninstaller.com/

Check version of Windows Update Agent

How to check which version of the Windows Update Agent is installed

1. Open the %systemroot%\system32 folder. %systemroot% is the folder in which Windows is installed. For example, the %systemroot% folder is C:\Windows.

2. Right-click Wuaueng.dll, and then click Properties.

3. Click the Details tab, and then locate the file version number.

Note: The latest version of the Windows Update Agent for Windows 8.1 is 7.9.9600.16422. The latest version of the Windows Update Agent for Windows 8 is 7.8.9200.16693. The latest version of the Windows Update Agent for Windows 7, Windows Vista, and Windows XP is 7.6.7600.256.