I suggest you also try the Reincubate Recover Files software, it's a new undelete tool that might prove useful, it can recover files even after the recycle bin has been emptied and even if shift+delete was used.
To recover deleted excel files go for Kernel for Excel file recovery software that recover and repair corrupt or deleted
excel file of all version. To know more visit: www.repaircorruptexcel.com
No offense to these two users personally, but it does mention in one of the stickies to be wary of any new users suddenly posting links or references to a new program. As I have never heard of these two programs, I don't know.
If anyone else here can verify that these programs are safe, then by all means go ahead and download. But if that's not the case, I would be careful
This is just for the benefit of the community. As I mentioned, no offense to these users. There are some people out there who aren't as informed about such things.