Assume that you install Update Rollup 8 for Microsoft Exchange Server 2010 Service Pack 2 (KB2903903) from Microsoft Update and then try to uninstall the update. In this situation, you may receive the following error message:
Error reading from file Drive:\Setup\ServerRoles\TransportRoles\<Folder Name>\Hygiene\ASDat.MSI. Verify that the file exists and that you can access it.