Error code when trying to install Microsoft Security Essentials on Windows 7

slipstream8 used Ask the Experts™
When I try to install Security Essentials on a new HP desktop with Windows 7, I get error code 0x80070643.

I looked this up and found where Microsoft Installer might not be turned on.  I checked, however, and Installer is indeed on.

Any solution to getting Security Essentials to install?

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The Problem appears to be related to installation of the latest version of Windows Update Agent:

Delete the MSIServer key from HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ and reboot.
- Installed Windows Update Agent from above link and reboot.
- Downloaded and installed Windows Installer 4.5 from link found here:  (prior installations of this update were fruitless).  Reboot.
- Installation of MSSE still failed but with new error code 0x8004FF01 -- another windows installer error.  Checked registry and noticed MSIServer key still missing.
- Downloaded package from here:  

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