Cannot able to boot

Are you trying to install, re-install Windows? If so, how?
Quote '. Systems having a SLIC can be preactivated with an OEM product key, and they verify an XML formatted OEM certificate against the SLIC in the BIOS as a means of self-activating (see System Locked Preinstallation). If a user performs a fresh install of Windows, they will need to have possession of both the OEM key and the digital certificate for their SLIC in order to bypass activation; in practice this is extremely unlikely and hence the only real way this can be achieved is if the user performs a restore using a pre-customised image provided by the OEM'

No, i'm not trying to re-install. I'm just trying to start my system. And even if i'm trying to format then also i'm getting the same.

Try reinstall the windows using the Restore/backup partition...
or using installation disk provided.........

Best list your system specs, what you were doing last before it failed. I think you have a Dell, and if the Windows OS has failed you may have to restore to factory with the following steps
http://support.dell.com/support/topics/global.aspx/supp...
If you have data you need to preserve there are methods you can use provided your HDD is operable.