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Restricting Access to Command Prompt
Prevents users from running the interactive command prompt.
If you enable this setting and the user tries to open a command window, the system displays a message explaining that a setting prevents the action.

Start -> Run -> Gpedit.msc -> User Configuration -> Administrative Templates -> Click on System -> On right pane find Preven Access to command Prompt -> Right Click -> Properties -> Click Enable -> Ok -> Reboot

When u restart ur system your Command has gone.

To restore this setting click on Not Configured

Try out the following key
combinations for Acrobat 6.0 & 7.0:
ctrl+ shift + b —> To hear the whole document
ctrl + shift + v —> To hear only the page
ctrl + shift + c —> To resume
ctrl + shift + e —> To stop