Addend:

I'm not familiar with Glary Utilities, but it's quite probable that the "undelete" info is contained in a "Glary Utilities Folder." If so, it may be on the drive where the utility is installed, and is not necessarily on the drive you're trying to clean(?).

If possible, you might try uninstalling Glary Utilities, to remove its record folder, and then reinstall it. (Be sure to use the Control Panel Add/Remove Programs to uninstall, if the program is shown there. After removal, check for any "remnant folders" where it was installed before reinstalling.)

A normal Windows delete keeps a record of deleted files only as long as they're in the "Recycle bin" but should discard the record when the bin is emptied. In WinXP (and most recent Win versions) you can hold down the Shift key when you choose delete to prevent files from going to Recycle bin, which might give a different result.

If you're really concerned about what's in the System Volume Information folder, Microsoft KB 309531 gives instructions for how to look at what's there.

John