On Saturday, January 19, 2008 11:15:01 PM UTC+4, Myra wrote:
I accidentally saved over a worksheet with another file. Can I recover the
original. I have searched and the most recent backup is from Feb. I do not
have a system that automatically backs up my files. I have tried auto
recovery, restoring the system to a previous date, searching my complete
computer. Any suggestions?

It's not the problem to come back your excel file to proper condition with download microsoft excel recovery software

http://www.oemailrecovery.com/excel_recovery.html