Excel adds a 1 to the end of a filename

I have EXCEL 2003 SP3.  

Whenever I open an existing Excel spreadsheet, Excel automatically adds a
1 
to the end.  Then when I do a simple "save" it defaults back to "my 
do***ents" instead of the original loacation of the file. Then I have to 
navigate back to the original location pick the original file name and
then, 
of course, confirm that I want to over write it.  This has got to be a
simple 
option that I am missing somewhere.  HELP!!!