excel selecting cells

when I select a cell in excel 2007 with the mouse and then arrow over with the arrow keys it starts to select all the cells that I arrow over on.  Then I can't get it to stop.  I have heard that it is extended or ext that is causing this.  And that hitting f8 will stop it.  This has not worked.  When I reboot it works fine again and then all of a sudden it starts doing it again.
mkramer777Asked:
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awaggonerCommented:
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Paul-BCommented:
Is this happening on a Desktop or a Laptop?
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awaggonerCommented:
Can you try the Scroll Lock key?
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mkramer777Author Commented:
This is happening on a laptop
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Paul-BCommented:
I would guess it has to do with the laptop keyboard in that you are accidently clicking a fn or num lock key unintentionally. You might try plugging in an external USB keyboard if you have one and see if the problem still occurs.
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