How to Understand Those Confusing Windows 7 File/Share Permissions
I install Easy Context Menu (ECM), where it allows, in my context menu, a selection called "Take Ownership".
Found to work well also is "NTFS Access".
If you're using Windows system and you lost an access to your files or folders (for example, after system re-installation), use NTFS Access to regain it. The program sets permissions recursively, so you don't have to repeat the process for each file or folder separately.
"Reset files permission" is another utility, I have in my collection, to download this app, find "Download the utility executable – use the password: lallouslab" without parentheses.