When I open a new worksheet and add numeric data, or try to add numeric data to my existing worksheets, Excel divides all my numbers by 100 (e.g. enter "1" into a cell and it displays "0.01". I need to enter "100" in order to get "1" to appear. THIS DOES NOT APPEAR TO BE A CELL FORMAT ISSUE. I suspect that I may have picked up a virus of some kind but after scanning my PC using Housecall it found nothing. Has anyone experienced this problem and found a fix?