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[MS KBs] Upgrade to System Center Operations Manager 2007 R2 fails with "An older version of Operations Manager 2007 that Setup cannot…

Full title: Upgrade to System Center Operations Manager 2007 R2 fails with "An older version of Operations Manager 2007 that Setup cannot upgrade has been found on this computer"

Symptoms

When trying to upgrade to System Center Operations Manager 2007 R2, setup starts...

When trying to upgrade to System Center Operations Manager 2007 R2, setup starts fine but immediately fails.  If you view the MOMx.log file you'll see errors like those listed below:

Note: The log file for the setup program is MOM*.log and is located in the Temp folder of current user profile (e.g. C:\Documents and Settings\Administrator\Local Settings\Temp\Mom2.log).

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MSI (c) (CC:EC) [11:45:45:028]: Doing action: FindRelatedProducts
Action 11:45:45: FindRelatedProducts. Searching for related applications
Action start 11:45:45: FindRelatedProducts.
FindRelatedProducts: Found application: {BEFA5017-8D77-4A17-85D9-FCAA34FD033C}
MSI (c) (CC:EC) [11:45:45:028]: PROPERTY CHANGE: Adding MOMV3_UNUPGRADEABLE_PRODUCT_FOUND property. Its value is '{BEFA5017-8D77-4A17-85D9-FCAA34FD033C}'.
Action ended 11:45:45: FindRelatedProducts. Return value 1.
MSI (c) (CC:EC) [11:45:45:028]: Skipping action: _AbortDowngradeProductAttempt (condition is false)
MSI (c) (CC:EC) [11:45:45:028]: Skipping action: _Set_MOMV3_PRODUCT_FOUND_EvalSameVersion_RETAIL (condition is false)
MSI (c) (CC:EC) [11:45:45:028]: Skipping action: _Set_MOMV3_PRODUCT_FOUND_EvalSameVersion (condition is false)
MSI (c) (CC:EC) [11:45:45:028]: Doing action: _AbortInvalidUpgradeProductAttempt
Action 11:45:45: _AbortInvalidUpgradeProductAttempt.
Action start 11:45:45: _AbortInvalidUpgradeProductAttempt.
An older version of Operations Manager 2007 that Setup cannot upgrade has been found on this computer. Uninstall the older version and run Setup again.
MSI (c) (CC:EC) [11:45:47:168]: Product: System Center Operations Manager 2007 R2 -- An older version of Operations Manager 2007 that Setup cannot upgrade has been found on this computer. Uninstall the older version and run Setup again.

Action ended 11:45:47: _AbortInvalidUpgradeProductAttempt. Return value 3.
MSI (c) (CC:EC) [11:45:47:168]: Doing action: FatalError
Action 11:45:47: FatalError.
Action start 11:45:47: FatalError.
Action 11:45:47: FatalError. Dialog created
MSI (c) (CC:08) [11:45:47:278]: Note: 1: 2731 2: 0
Action ended 11:45:48: FatalError. Return value 2.
Action ended 11:45:48: INSTALL. Return value 3.

===

You may also see the following event:

Event Type:       Error
Event Source:    MsiInstaller
Event Category: None
Event ID:           1013
Date:  <date>
Time:  <time>
User:  <user>
Computer: <servername>
Description:
Product: System Center Operations Manager 2007 R2 -- An older version of Operations Manager 2007 that Setup cannot upgrade has been found on this computer. Uninstall the older version and run Setup again.

http://support.microsoft.com/default.aspx?scid=kb;en-us;2004885&sd=rss&spid=12584

Read the complete post at http://wmug.co.uk/blogs/cliffs_blog/archive/2009/11/16/ms-kbs-upgrade-to-system-center-operations-manager-2007-r2-fails-with-quot-an-older-version-of-operations-manager-2007-that-setup-cannot.aspx