I have three large hard disks that I use to store backups of the system. Some program -- I think it was the defragmenter -- caused Win 7 to place huge files (> 4 GB) in System Volume Information. Nothing I do wil let me delete these files. I cannot even take ownership of them. When I try to take ownership of either the file or of System Volume Information I receive an "Access is denied" error on the file name. Nothing should prevent an administrator from taking ownership of any file on his system. How can I delete these huge files? Please do not answer "Use Disk Cleanup to delete all but the last restore point." That runs, but it deletes nothing. On a previous installation of Win 7, I could take ownership of System Volume Information and delete its contents, but ot on this new installation.