To resolve this condition: 1. Uninstall the version of SaVision OpsMgrExtension that has been installed on this computer. ...

To resolve this condition:
1. Uninstall the version of SaVision OpsMgrExtension that has been installed on this computer. 
2. Run Setup again to upgrade to Operations Manager 2007 R2 Operations Console. 
3. (Optional) Install the Operations Manager 2007 R2 version of SaVision OpsMgrExtension. 

For more information, read the KB article  at http://go.microsoft.com/fwlink/?LinkId=149128.