Hiyya woot and welcome
Didn't just so happen to make either a rescue disk or system image by any chance?
I don't know about evryone else but would a safe boot work? - F8 on power up.
Personally I would - only because I can hook the HDD up as an external to another machine and try and get that data off that way - possible?
Um what about that USB install method download the ISO - boot from it and when the screen comes up do a repair?
If you do a factory default though your can kiss the data bye bye.
- maybe even Recuva may work even then? as I have used that before Recuva - Undelete, Unerase, File and Disk Recovery - Free Download