What McAfee product are you referring to? Have you checked your Windows Event Viewer for any log entries that might point to an issue? In my experience with VirusScan Enterprise, the On-Access Scanner is disabled when McShield.exe fails to initialise the Scan Engine (either corrupt Scan32.dll or DAT file) or other System Core components are corrupt or missing. You might also want to check that the McAfee product version you are running is actually compatible with your OS and Service Pack level (refer https://kc.mcafee.com/corporate/index?page=content&id=KB51109). I take it you have tried to re-install the VSE client? The other option is, if your system is managed via an ePO your system might have a policy associated with it to disable the OAS component. It's a bit hard to help you troubleshoot without details of the product and logs from the system.
Sorry, for the late reply. I am running McAfee Antivirus Plus. last updated on 5/31/15. it was installed 12/27/15 and has been running fine. No I have not tried to reinstall the VSE client...
Moved this to Consumer - VirusScan as a more appropriate spot for it.
I trust that VSE is not involved here as that is an Enterprise product and totally different from retail so let's leave mention of that out of the discussion.
First make sure your system is totally up to date, including the latest version of Internet Explorer, even if you don't use it, McAfee software does so it's important that it be up to date.
Secondly go to Control Panel > Programs and Features and check to see if there's an entry for Security Scan Plus, if so, uninstall it. It's an option offered with many 3rd party products, that is not necessary if you already use the software.
Thirdly try the following:
Uninstall all McAfee products using Control Panel > Programs and Features
Run the MCPR cleanup tool to clean all remnants from your machine and then reboot.
Reinstall from your online account, not from any media you may have.
This procedure is all outlined in this FAQ.
If all else fails, Technical Support is available free of charge by phone or online chat and linked below.
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thanks. I will try the suggestions and let you if it works.
Good luck ;-)