How to change the security settings of many files at once

I have 1000 files both unused and not needed anymore that together weight (10 GB) on my hard drive/disk with different Owner.

I must change them all to Administrator to delete them all.

I know how to change single file's security Owner to Administrator, but doing this to 1000 files this way will take too long.

Google doesn't show me faster way to do this.

Best Regards and Thanks in Advance

Very simple do change the files but the folders which will change all the files with our tool its a breeze Take Ownership Shortcut - Windows 7 Help Forums

Thank you! It both worked and helped me! Excellent new option added to my context menu right now.