Reset Security on all folders

If you have NTFS partition you might be knowing that you can set permission to files or folders to be accessible Only By you without any 3rd party software, but problem is if you had previously changed permission level & you reinstall your Windows, you might not be having any access over that file or folder, but you can regain access to that file or folder by following steps below

a] click on run in start menu & type CMD
Now in Command prompt type

CD\

b]Now type

CACLS * /E /T /C /P Administrators:F System:F

This Will reset security permission of almost all folders(Except Some Windows Folders) so that it is accessible by all users having administrator rights .

You can even follow same procedure on other drives
To change drive for example to change to D drive type D: in command prompt and then follow steps given above.