When I hit the tab key, rather than doing a next-field, i.e.: "Subject" line to
message area on a mail message, next input field on a web site, or indentation,
as in Word or a text editor, it switches tasks, from Word to the browser to the
mail program.  What you'd expect from ALT-TAB.

If I reboot this goes away for a while, often a long while, then returns.

Sometimes it just goes away on it's own.  Perhaps I've done something to both
activate and de-activate this, but I'm not at all clear on what that might be.

It usually starts after bringing the system out of the monitor being off due to
my power savings options, but not every time.

No new hardware, no new software (that I'm aware of anyway), virus scan finds
nothing, Ad-Aware and Spybot find nothing.

Ideas?  Especially on some key-combination I may be hitting to do, and undo,
this?

   - Bill