I was having the same problem with my system flashing \WINDOWS\SYSTEM32\CONFIG\ .I just reinstall my C drive without knowing that i could lost my data and it exactly happens.I come up with the solution by reinstalling C drive but lost data.Then suddenly my eye caught a recovery tool called Stellar Phoenix Partition Recovery Software which really recovers my lost data and files.This software is non-destructive and effective.Give a try
Windows Partition Recovery Software recover partition or deleted data from hard drive, floppy disk, CD, DVD, USB storage media