An antivirus program that scans and removes malicious files from your computer, McAfee also scans incoming and outgoing e-mails as well as warns you of files trying to change your system's configuration. When installing new software on your computer, McAfee's On-Access Scanning may block the software's installation process. The scanning utility may also block the installation process from accessing your computer's Internet connection. You can disable the scanning utility and restart it once you are done installing the new software.
Right-click on the "McAfee VirusScan" icon, a V-shaped shield, in your computer's System Tray. The System Tray contains your computer's clock.
Click "Disable On-Access Scan." If you don't see the "Disable On-Access Scan" option, skip to the "Activating On-Access Scanning" section.
Right-click on the McAfee VirusScan icon in your computer's System Tray and click "Enable On-Access Scan" to reactivate McAfee On-Access Scanning.
Click "Start," "All Programs," "McAfee" and "VirusScan Console."
Double-click "Access Protection." Click the check box next to "Prevent McAfee Services from being stopped" to deselect the option and place "Disable On-Access Scanning" on the McAfee VirusScan list of options.
Click "Apply" and "OK." Click "File" and "Exit" to close the McAfee VirusScan Console.
Complete the steps in the "Disabling On-Access Scanning" section.
Don't forget to enable On-Access Scanning after installing software or performing other tasks on your computer.