Was your hard drive completely dead? If it wasn't completely crashed, see if you can search it for any files ending in *.taxYYYY (where YYYY is the year). If you have multiple Windows user accounts, search from each user account, and also look in the Recycle Bin.
If you used the desktop TurboTax (CD/download) last year and prior years, then unfortunately the only copies of the returns would be saved locally--either on your computer or any external backup media. Your return files would not be in an Online account. TurboTax does not have a process to restore desktop data files.
