You have damaged your file file. You may be able to recover
data but the first thing I would do is to copy your file and to
work from the copy of the file.
Always check the file with your virus scanner and anyone else
who attempts to open your file should do the same.
Open Notepad and drag the file to the notepad, if you can
see text that is a good sign.
You may be able to open the file with another version of Excel
usually the higher the version the better. You may be able to
open the file with OpenOffice their free version of StarOffice,
but suggest going to
http://www.mvps.org/dmcritchie/excel/backup.htm#recovery