Remove Logoff button from start menu

U must be Administrator of ur machine

Goto Run type gpedit.msc hit enter

Now on left pane double click User Configuration

Now on left pane double click Administrative Templates

Now double click on Start menu and Taskbar option in left pane

Now on right pane double click on option Remove logoff on the start menu.

Then select Enabled when a window pops up.

Click OK...