How do I remove (unknown) user in permissions & sharing, please?

I re-installed OS X with archive install. I am reinstalling preferences, etc... using Time Machine and my archived Previous System folder. However, many folders are marked and I have an (unknown) user with Read&Write Priveleges in Sharing & Permissions for files within 'Previous System' folders. I am unable to remove (unknown) with - and I have no option for setting 'No Access' to this user.
How do I remove (unknown) user with Read&Write Priveleges in Permissions?
Using Terminal, I have ascertained that my uid=501
Macintosh:~ symone$ ls -ladeO /Previous\ Systems.localized/Previous\ System\ 1/Users/symone/Library/Audio
drwx------+ 5 502 staff - 170 8 Sep 2011 /Previous Systems.localized/Previous System 1/Users/symone/Library/Audio
0: group:everyone deny delete
Macintosh:~ symone$ id
uid=501(symone) gid=501(symone) groups=501(symone),98(_lpadmin),81(_appserveradm),79(_appserverusr),80(admin)

Hmmm, doesn't sound good for your drive.
Check the S.M.A.R.T. status of the drive in Disk Utilty by highlighting the Drive & looking at the bottom of the window.
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

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See screen shots... got any ideas? (note clicking "–" does not remove the "Unknown User" they are stuck, hence my posting)
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