If affordable, if possible, boot a usb or dvd backup/restore/clone utility, one of your choosing, and clone your problematic source HD onto an external target HD or media of your choosing, HD would be best. 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 in this thread and several others: several data recovery specialists indicate that many end-users, in the midst of their crisis, often "try everything", some succeed, some don't, and those that don't succeed find out from DR companies that now recovery is much harder, much less successful (in general), and much more expensive.