If affordable, if possible, boot a usb or dvd backup/restore/clone utility, one of your choosing, and clone your source HD onto an external target HD. Put that target HD in a safe place, in case more drastic recovery attempts are needed. Meanwhile, there are numerous free and pay-for data recovery utilities and there are many threads all over The 'Net that can guide you through DR. The reason I'm posting the clone idea: several data recovery specialists indicate that many end-users, in the midst of their crisis, often "try everything",and if they don't succeed, the phoning or emailing give them this news from DR companies: now recovery is much harder, much less successful (in general), and much more expensive.