Microsoft KB Archive/837770

= PRB: Error occurs when you try to rollback MDAC installation =

Article ID: 837770

Article Last Modified on 3/16/2007

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APPLIES TO


 * Microsoft Data Access Components 2.6
 * Microsoft Data Access Components 2.7
 * Microsoft Data Access Components 2.8

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SYMPTOMS
When you try to rollback an installation of Microsoft Data Access Components (MDAC), you receive the following error message:

Fatal Setup Error

Microsoft Data Access Components cannot be rolled back. Setup has detected that a different version of Microsoft Data Access Components is installed on the machine.

This message can appear both as a message box during the installation and in the dasetup.log file that is created during installation.



CAUSE
This error occurs because you have installed MDAC security patches or other fixes since the last full MDAC installation on your computer. The MDAC installer does not support rollback in this scenario.



STATUS
This behavior is by design.



MORE INFORMATION
The installer in MDAC 2.6 and later versions has built-in rollback functionality that can rollback to the previously installed MDAC version as long as no additional patches or fixes have been applied.

