Win7 SP1 Update not installing - mismatched Mail file. 0x80004005

After days of chasing this, I'm, baffled and would appreciate assistance.
I have been unable to install SP1 since it came out, and finally committed to solving the issue. Fail occurs at 80+% completion with the error 0x80004005.

CBS.log Error line says:
Attempted to uninstall a version of a non-driver component that is not installed, version: 0X600011db04001, component: x86_microsoft-windows-mail-core-dll_31bf3856ad364e35_6.1.7600.16385_none_585517a9869db81d, owner: Microsoft-Windows-Client-Features-Package~31bf3856ad364e35~amd64~~6.1.7600.16385.Microsoft-Windows-Client-Features-Update [HRESULT = 0x80004005 - E_FAIL]
Failed to mergecomponent [HRESULT = 0x80004005 - E_FAIL]

The installer seems to get stuck dealing with the Windows Mail msoe.dll. Two years ago I had followed the manual steps posted in this forum to restore Windows Mail in place of Windows Live Mail. Once the issue was identified as Mail-related, I restored the original msoe.dll files in the two Windows Mail folders. (see attached screencap.) I then switched to/uninstalled/reinstalled Live Mail (which works) to try to get SP1 to find the files it is expecting to find.

Most recent steps taken:

- Rebooting with non-microsoft startups and services disabled, including AV.
- Ran the System Update Readiness Tool. Hotfix for Windows (KB947821) No issues reported.
- Ran the Fix-It to Automatically diagnose and fix common problems with Windows Update.
- Ran the Fix-It to increase filter drivers limit from 8 to 14
- Ran SFC /SCANNOW from an elevated CMD prompt.
- Attempted to install the Service Pack from the x64 full download.
- Repaired Windows Live Mail (issued discovered and reported fixed.)
- Uninstalled Windows Live Mail (Live Essentials)
- Reinstalled Windows Live Mail (Live Essentials - Mail module only which opened successfully)
- Repeated the System Update Readiness Tool. Hotfix for Windows (KB947821) No issues reported.
- Uninstalled Windows Live Mail
- Attempted installs from full download in safe mode.

Throughout - rebooted and reattempted the SP1 install between each step - always with the same result (same error 4005 and CBS log entry above).

Is there a registry update I can make that would make SP1 skip over trying to uninstall the already uninstalled Mail software?
Full CBS log attached.
All ideas appreciated!

Here is the log from the scan.

A year+ ago, I did use "take ownership" (from within my admin account) so permissions may be an issue. I'll give that a shot.

Examining the msoe.dll (both instances) it is showing all permissions checked including Full Control but excluding Special Permissions for Trusted Installer and Administrators, and Read, Read & Execute for SYSTEM and Users. File version 6.1.7600.16543 Owner is set to my (Admin) account instead of the Administrator's role.

I have changed the ownership to Administrators, confirmed Full Control, and am retrying.

No Joy.
I see from the error that SP1 is expecting to find file version 6.1.7600.16385 which does not match any version that is retained in the folder. The Win7 version is 6.1.7600.16543. (The Vista version is 6.0.6002.18197.)
Any ideas about how to either obtain the file it wants to find or should I try to update the registry to match the version numbers? (While this may seem an obvious step, I'm not familiar with the subtleties of the registry and afraid of doing more harm than good, so coaching is appreciated.)

Before your latest note arrived, I looked at a few registry keys and they match the files that are installed so it seems SP1 is hard coded to seek version 16385. See screencaps.

Files located and copied, tried the update, but no joy!

Latest log attached -
Only difference, Owner = Administrators
There were no specific permissions for TrustedInstaller - is there a way to add that?
Permissions for Administrators were Full Control.
No changes were necessary, these were the default permissions form the winsxs folder.

Ideas?

The error message suggests the file is "not installed" despite the registry entry. Is there a process to "install" it?