Hello and welcome to the forums and notice if in Windows Explorer you have a folder named with a name together before or after the old name.
It's funny you mention it, usually when you do a restore to factory mode as if it were the first day of installation of Windows, it should have removed everything.
What I advise you is that you do a CHKDSK, you go to Windows Explorer or the PC icon, you select the C: \ unfold the shortcut with the right mouse button, you go to Properties> Tools> Check Now, you select both options and give sign, waiting to perform the inspection of the hard disk will not be required or scheduled scanning start after a reboot or will do so at the time.
There may be errors in the allocation table and therefore gives bad data, now if you want to test is to start a Linux LiveCD such. Ubuntu, which allows you botear and execute the operating system in test mode, not changing anything, and explore if maybe there is there, if so Linux will show it, because it matters little NTFS security.
greetings;)