I don't think you have to use any data recovery software.. try checking your backup files from last night??? If you back up your data everyday that is...

If you are using windows than try using System Restore by going to Help and Support..

If it is something else please let us know again..

If you were using a shared drive or a drive that is in SAN than ask your admin to help you recover your data, since they are backed up everyday...

Hope this help's or I might be saying everything you knew and did already...

Cheers..