hi
i'm assuming that you are talking about excel 07......
some have reported this as a bug and adjusting the zoom usually helps.
see this previous post.
http://tinyurl.com/3wofsf

if you are using 03 or earlier, try tapping the f8 key

regards
FSt1

"Calbobi" wrote:

Using Windows 7, I haven't had any problems until now. When I click on 1
square, the computer highlights 3 verical squares. Did I turn something "on"
and not know it? And how do I get it to highlight only the square that I
click on?