I install windows 7 ultimate but bitloker not exist in control panel, what can i do to activate it

For enabling Bitlocker, please refer to this Microsoft article. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration

Also note that Bitlocker is only avaiable on Windows 7 Ultimate and Windows 7 Enterprise editions (see http://www.microsoft.com/windows/windows-7/compare/default.aspx, http://www.microsoft.com/windows/enterprise/products/windows-7/features.aspx) Hope this helps.

First verify that the installation is WIndows 7 Ultimate or Windows Enterprise. If that is so, the only way you cannot see the icon in controlpanel is by using a local policy to hide it. http://blogs.technet.com/b/bitlocker/archive/2010/09/14/how-to-prevent-local-administrator-from-turning-off-bitlocker.aspx Regards, Manoj Sehgal