unstable screen

Posted: 02-19-2009, 10:15 PM
I am running 64 bit vista on an XP420. There are occasions when I am in the
middle of a task such as an excel worksheet that a mouse movement will cause
the screen to either dissapear or enlarge to maximum font sixe and
there-fore be off the screen. There is no warning message asking if I want
to exit or save the work. What causes this instabioity and how do I avoid

unstable screen

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