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The mcupdate.exe process incorrectly displays an error dialog in Session 0.

If the 'McAfee Agent Backwards Compatibility Service' (macompatsvc.exe) is either stopped or does not process requests reliably (for example, it is compromised by untrusted injected .dll libraries that render the process untrusted by McAfee Validation Trust), the VSE executable responsible for initiating McAfee Agent to update the DATs at the conclusion of installation (mcupdate.exe) may display an error message. That message will display in the user account session that is installing the product. If that session is the SYSTEM user's session (Session 0), the message will display on the desktop for Session 0. That desktop is accessible only to logged on local administrators. Because the mcupdate.exe message may be displayed on a node that has no logged on local administrator, it may appear that the installation has halted. The installation has actually completed almost all steps.