Excel hightlights multiple cells when I select one, HELP!

S

Semm

Got Excel 2007 a few months back. Having major problems. Excel will randomly
highlight between 2 and 10 cells when I click on one. I've re-installed a new
version of Office with same results. I've even bought a better mouse. Same
problem happens on my laptop touch-pad.

Other problem, the screen flickers when using Excel for more than 10
minutes. All problems become worse the longer the program is being used. My
office techs have no idea what's wrong with the program.
 

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