icacls granting access to all users on windows 7

Solution 1:

c:\windows\system32\icacls c:\folder /grant "domain\user":(OI)(CI)M
c:\windows\system32\icacls c:\folder /grant "everyone":(OI)(CI)M
c:\windows\system32\icacls c:\folder /grant "Authenticated Users":(OI)(CI)M

Open command window and type c:\windows\system32\icacls /?

Solution 2:

Only these two answers worked for me:

In an Administrator Command Prompt:

C:\Windows\System32>takeown /r /d y /f f:\backup
C:\Windows\System32>icacls f:\backup /t /grant Everyone:(OI)(CI)F

(OI) is for future files and (CI) for future folders.