When I try to fromat a celland want to change the category under the number tab I get an error message that tells me "Your entry cannot be used. An integer or decimal may be required." Deciaml places is highlighted but when I enter any number in this field I get the same error message. I have to right click the title bar of the Format Cells window to close it. Sometimes I then get an Application Error- Error access violation(0xc0000005). Address:0x308047fe. How can I get rid of this bug?