If your McAfee antivirus software or any other antivirus software hangs or freezes when you run an on-demand scan or any other virus scan, then you can download and apply this hotfix from Microsoft and see if it helps you.

This hotfix KB2904100 is meant for computers running Windows 8.1, Windows Server 2012 R2, Windows 8 or Windows Server 2012.

If your antivirus software is crashing, request hotfix KB2903025.