Are you talking about On-Access Scan OR On-Demand Scan???...
If you are talking about On-Access Scan it's realtime scanning & it starts on windows Startup. And you will not see any PopUp Window for On-Access Scanning, you need to check On-Access Scan Statistics(VirusScan Console--->right click On-Access Scanner--->Statistics).
And regards to Autoupdate you can check VirusScan About to confirm Latest DAT version OR if the DAT is not getting Updated please sent the AutoUpdate Logs.
Please let us know if you are referring about McAfee virus scan enterprise or SaaS programs ????