Search your drives for Money backup files. One way to do this for your current drive is to run this command in a command window:
dir \*.mbf /s
An option if you want to specify a drive, such as C:, then do this command:
dir c:\*.mbf /s
It can take a long time to search everywhere.
Be glad your hard drive did not fail. The good part about this is it will motivate you to have more vintages of backup, and inspire you to have backups on other drives too.
If was only with Money 2006 and beyond that Money would automatically change the names for backup files so you did not keep overwriting your only backup file.