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Using proper locations to keep your office documents and making regular backups are great preventive measures against data loss. If you've lost a document or the whole bunch of them, do not despair. Modern data recovery tools can reliably detect, locate and restore documents even if they are stored on a badly damaged, corrupted, formatted or repartitioned hard drive or other storage media.

Use Hetman Office Recovery for recovering your corrupted MS Excel file: https://hetmanrecovery.com/recover_deleted_document/office-software.htm

Without seeing the file, it is difficult to diagnose what is going on, but I will offer some ideas.

What version of Excel are you using? Are you using Excel 2003? Was the file you are trying to open created in Excel 2007 or Excel 2010. If so, it might be using the new format and therefore will not open in Excel 2003 and older.

It is possible the Excel file is data that was imported from a source in which Excel cannot import. Does the Excel spreadsheet contain any imported data?
Try to use: XLSX Viewer Tool here : http://www.xlsx.viewertool.com/
Those are the most likely causes of the corrupt data. Is every file you open in Excel corrupt, or just this one workbook? If it is just this one workbook, then, yes, it sounds like it is corrupted. If every file you open with Excel is corrupt, then your version of Excel could be corrupt, but that is unlikely.

Excel file can be repaired manually if it is less corrupted but Open and Repair program doesn't work if highly damaged due to corruptions. I searched for solutions to repair corrupt Excel file and found one solution which is full of information and provides a guaranteed solution. I am sharing this solution with all the users -Excel Repair Toolbox. Follow the exact steps given in this programm and you will be able to access the data. Download Microsoft Excel Repair tool

If the extension of the corrupted file is not xls or xlsx), have you tried renaming it with the xls or xlsx extension and opening with excel? Have you tried opening with Google Docs Spreadsheet?

MS Excel comes with an automatic recovery feature that attempt to reopen corrupt excel file along with repairing a file. If it fails to repair a corrupt excel file then try to open a file without repair. Sometimes this automatic recovery feature fails to open & repair corrupt excel files at this stage users can repair corrupt excel file manually.


To Manually Repair an Excel File: For manual repair of a corrupt excel file, you have to perform following steps:

• Go-to the File Menu & click on 'Open'
  
• Now select the file that you want to repair and click on the arrow next to 'open' button.
  
• Click on 'Open & Repair' & any one method that you want to recover your data.
  

Source : Link

Lost Excel file can be recovered from:

1. Recycle Bin - If you have deleted the file with normal delete.
   
2. Backup - If have maintained the backup of file.
   
3. Email - It may possible that you have mailed the file to someone.
   
4. 3rd Party Recovery Software - Recuva, Stellar Data Recovery ...
   

Easiest way would be to use the Undo function to work your way back to the point prior to deleting the worksheets. If you can't back up through the list that far, you could close the file WITHOUT SAVING IT, then reopen the original file again. If you have already saved the document after deleting the worksheets, you will have to restore it from a backup (you do perform backups, right?) and continue working fro there.

To open a corrupt file; you have to repair the file first.
MS Excel has a special feature to repair corrupt file that is Open & Repair.
Repair a corrupt excel file by following steps:

• Open a blank wordbook.
  
• Go-to the File menu and click on the open button.
  
• Now select your corrupt file and click on the arrow next to open button.
  
• Select Open & repair option and click on the open button.
  
• Save as the file and give the new name.
  

Additionally you can try 3rd party excel repair software if Open & Repair fails to repair corrupt file.

Try this link http://www.download.com/Free-Word-Excel-Password-Wizard/3000-2092_4-10249516.html?tag=lst-0-1 It should help you unlock the Excel file and break the password. Good luck