Copy a cell would crash Excel 2003 and some times when pasting it would crash too.
Found the problem with Excel 2003, it is related to bluetooth though, o_0
then I went in ==> HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Excel\Addins
and there was an entry for BtOfficeAddin.BtOfficeintergration.1
And change the LoadBehavior key from 3 to 0 and all is working well now.