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Note: In Windows 7 Home you have access to Security tab only from Safe Mode

Please go to Start and choose My Computer
Right click on a partition from Computer and select Properties
In Properties window you can select Security tab
Missing
When you open Properties window for a file you observe that the Security tab is missing
Gpedit:          

Warning Computers running Windows Vista Home do not have access to Group Policy (gpedit.msc)
This method shows you how to Disable/Enable Security Tab from Group Policy
Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type gpedit.msc and press ok
In the Group Policy window please navigate to User Configuration -> Administrative Templates ->
Windows Components -> Windows Explorer  and open Remove Security tab
The Default state is Not Configured and Security tab is Enable
To Enable Security tab select Disable
To Disable Security tab select Enable

To finish press ok button and close Group Policy window
CMD:          
This method shows you how to Disable/Enable Security Tab from Command Prompt
Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type cmd, right click on cmd icon under the Programs and click on Run as administrator
Please confirm User Account Control pop-up
Please select, right and copy a registry key from below, then right click on command prompt window,
select Paste and press Enter

To Disable Security tab:

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer /v Nosecuritytab /t REG_DWORD /d 1 /f

To Enable Security tab:

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer /v Nosecuritytab /t REG_DWORD /d 0 /f

To finish please close command prompt window
Regedit:          
This method shows you how to Disable/Enable Security Tab from Registry Editor
Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type regedit and press ok
Please confirm UAC pop-ups in order to continue
Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Please navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
\Explorer and locate Nosecuritytab registrykey
Double click on Nosecuritytab and edit the value:

To Disable Security tab:

Change the data value with 1

To Enable Security tab:

Change the data value with 0

To finish press ok button and close Registry Editor window
Description:  

On NTFS volumes, you can set security permissions on files and folders. These permissions grant or deny
access to the files and folders. You can view security permissions for files and folders by completing the
following steps:

- In Windows Explorer, right-click the file or folder you want to work with.
- From the pop-up menu, select Properties, and then in the Properties dialog box click the Security tab.
- In the Name list box, select the user, contact, computer, or group whose permissions you want to view.
 If the permissions are dimmed, it means the permissions are inherited from a parent object.

For more information please continue to read the official Microsoft article
How to Disable/Enable Security Tab
Windows Vista Windows 7 Windows Xp
   
   
   
   
   
   
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