Excel 2003
 

Ive developed a lot of problems, with opening files, I get a 'seroius error
message last time you opened'....every time I try to open files, Ive clicked
to try and enable them, Ive deleted them completely, but I canot now open a
saved file in any format without this message. Even saved ones are freezing
and non responsive.

Any help other than already tried?