If McAfee is acting up on your computer, reinstalling the program will likely solve the problem. Do this as soon as you experience trouble; until the issue is resolved, your computer might be sitting unprotected. Because they are connected to every folder on your computer, virus programs require a little more work to reinstall than most other applications. However, McAfee offers a tool to automate much of the process.
Remove the program from Windows. To do this, go to your Control Panel (from the Start menu) and select "Add or Remove Programs." Select the McAfee software you wish to reinstall and click "Remove" or "Uninstall."
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Run the McAfee Removal tool. You can download the file, titled MCPR.exe, from McAfee Support (link in Resources).
Install your McAfee product from scratch. If you purchased it yourself, use the CD or re-download the software for free (link in Resources). If your Internet service provider or computer manufacturer provided the software, contact them for the installation file. The McAfee Support site provides links to contact the major companies.
Restart your computer.