give PhotoRec a try. PhotoRec is a signature based file recovery utility and may be able to recover your data where other methods failed.
PhotoRec is file data recovery software designed to recover lost files including video, documents and archives from hard disks, CD-ROMs, and lost pictures (thus the Photo Recovery name) from digital camera memory. PhotoRec ignores the file system and goes after the underlying data, so it will still work even if your media's file system has been severely damaged or reformatted.
Restore your damaged or corrupt MS Excel file instantly by using Kernel for Excel Repair software. This tool facilitates its user with two different recovery modes – Single File Mode and Multi File Mode to recover the corrupt MS Excel file immediately. The software treats the original file as a read-only copy, copies data from it, and then recreates the entire new Excel file from the recovered data.