the files are located but it is most likely an ownership problem if you re-installed Windows. Here is a link that gives you various options and methods of taking ownership. I would suggest taking ownership of the entire folder yout data files are located in.
I am using windows 8 and I found some virus in it, so I had re installed windows 8 by using the option reset to factory default settings. After finishing installation when I try to open my documents or my pictures it says it is not accessible. Could some one help me with this?