Mac Forum / Applications / Excel / October 2007

My 2007 version of Excel is unusable.  Whenver I make an update, even
something as simple as  changing the font size in a cell or cells it takes
forever.  As soon as I hit the enter key I get the hourglass, within seconds
a totally white screen with "Excel Not Responding" at the top  pops up.  If I
look in task manager it shows two occurrences of the task as follows:

TASK                                                          Status
Myspreadsheet(Not Responding)                     Not Responding
Myspreadsheet                                              Not Responding  

The task will eventually finish if I wait long enough.  

If I download this same spreadsheet to a maching with Excel 2003 the
response time is excellent, I want only seconds or a fraction thereof.  

This happens with every action I take.

Yesterday I uninstalled my Office Professional 2007  and reinstalled, I
donwloaded all maintenance and restarted my machine.  I then opened my
spreadsheet, clicked on a group of cells, and attempted to change the font
size.  I was literally hung up for 20 minutes. Same problem...

Any ideas?  
tln