I've been having a problem with updating my viruscan. What seems to be happening is that it will download the updates, but when it moves to install them it comes up with the message 'McAfee VirusScan API Daily Update Module has encountered a problem and needs to close.'.
I ran the anti spyware programmes mentioned in this forum (as well as Mcafee's free online scan, which came back clean), then tried uninstalling and running the MCPR tool, then reinstalling. It was unable to run the preinstall scan during installation without crashing and the problem with updating continued.
I've been in contact with McAfee support, who directed me to replace my hosts file and run a separate update application, but no joy. I've been in contact with McAfee through chat who first told me I needed to remove the spyware programmes mentioned above (no help) and then that they couldn't help any more.
Try to do an uninstallation again, but after running the MCPR tool, do a search of all McAfee files and folders and delete them (especially in Program Files and C:/Documents and Settings/<user>/Application Data and C:/Documents and Settings/<user>/Local Settings/Application Data). Also search for relevant McAfee registry keys (be careful in doing so and make sure you make a backup copy of your Registry) and remove them.
also make sure your Windows is fully updated, including Java.