The Dasetup.exe program, when used with the /u switch, may
not correctly roll back Microsoft Data Access Components (MDAC) to the previous
version. You can verify this by using the Component Checker utility which is
available at the following Microsoft Web site:
When the MDAC setup encounters errors during the
installation process, the expected behavior is to roll back any files and
settings changed during installation to their original configuration. However,
a known issue with Windows 95, Windows 98, and Windows Millennium Edition (Me)
systems prevents this rollback from occurring correctly.
errors are encountered during MDAC installation (for instance, Msxml3.dll is
not registered correctly), the MDAC installation completes and reports success
even though the installation was not entirely successful. Because the MDAC
state on the computer is not a clean installation, subsequent MDAC rollbacks
On Windows 95 and Windows 98, you can use Component Checker
to reconfigure the MDAC components on a computer as an alternative to the
Dasetup.exe rollback method.
There is no workaround on Windows
Millennium Edition (Me) if Dasetup.exe rollback fails. In this case, contact
Microsoft Product Support Services.
information on how to reconfigure MDAC components, click the article number
below to view the article in the Microsoft Knowledge Base:
HOWTO: MDAC Setup Troubleshooting Guide