Windows 7 File permission problem after reinstallation

Run command line as administrator

For Folders or Directories (will perform action recursively):

takeown /f directory_name /r /d y
icacls directory_name /grant administrators:F /t

Replace file_name or directory_name with actual file name or folder name, with path when applicable. The first command will take ownership of the file or folder specified, and the second command will grant full control permissions to administrators user group. Note that when using command for folders, to command will run recursively. To prevent the task been perform recursively, remove the “/r” and “/t” switch.


Source: http://forum.thewindowsclub.com/windows-tips-tutorials-articles/18379-how-take-ownership-full-control-permissions-files-folders-windows.html