Are you using Office 2007, as your profile indicates?, If so, the Diagnose option should be there. Alternatively, you can repair the Office installation via Start > Windows Control Panel > Programs > Programs & Features > Microsoft Office (version) > Change>Repair.
As this doesn't happen all the time, are you perhaps using a mouse with a touchpad? If the touchpad is active when using a mouse, even brushing it slightly can change the selection. Most touchpads come with utilities to disable them when a mouse is connected.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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