I have administrator rights, however I cannot write files to C drive (have to confirm each time that I am the administrator), install programs properly etc. It is not working even if I run installers via cmd with elevated privileges. I tried to apply "take ownership hack" to the entire C drive, but it did not solve the issue. I really don't want to reinstall OS and all the programs, is there any solution which will reset NTFS permissions to the default and secure state?? Help