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Here's how to Fix McAfee won’t open or start on Windows computer.

There are a few reasons why McAfee might not open or start on your Windows computer. Here are a few things to check:

* **Make sure McAfee is installed and activated.** If McAfee is not installed or activated, it will not start. You can check if McAfee is installed by going to the Control Panel and searching for "McAfee." If McAfee is not installed, you can download it from the McAfee website.
* **Make sure your computer meets the minimum system requirements for McAfee.** McAfee has minimum system requirements that your computer must meet in order to run McAfee. You can check the minimum system requirements for McAfee on the McAfee website.
* **Make sure McAfee is not blocked by your firewall or antivirus software.** Your firewall or antivirus software might be blocking McAfee from starting. You can check if your firewall or antivirus software is blocking McAfee by disabling it temporarily and trying to start McAfee again.
* **Make sure McAfee is not corrupted.** McAfee might be corrupted if your computer has recently experienced a power outage or other system crash. You can try to repair McAfee by running the McAfee Troubleshooting Tool.
* **Reinstall McAfee.** If you have tried all of the above and McAfee is still not starting, you can try reinstalling McAfee. To reinstall McAfee, you will need to download the McAfee installer from the McAfee website.

If you have tried all of the above and McAfee is still not starting, you may need to contact McAfee support for further assistance.

Here are some additional tips for troubleshooting McAfee problems:

* **Make sure you are using the latest version of McAfee.** McAfee regularly releases updates that improve security and fix bugs. You can check for updates to McAfee by going to the McAfee website and clicking on the "Check for Updates" button.
* **Keep your computer up to date.** Outdated software can be vulnerable to security threats. You can keep your computer up to date by installing updates for your operating system and other software.
* **Use a firewall and antivirus software.** A firewall and antivirus software can help protect your computer from viruses, malware, and other threats.
* **Be careful what you click on.** Phishing emails and malicious websites can contain viruses and malware. Be careful what you click on and only download files from trusted sources.
* **Back up your data regularly.** If your computer is infected with a virus or malware, it can damage or destroy your data. You can protect your data by backing it up regularly.