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There are a few reasons why Performance Monitor (perfmon.exe) might be using high CPU usage on your Windows computer.

* **Corrupted or outdated Windows system files:** Corrupted or outdated Windows system files can cause Performance Monitor to use high CPU usage. To fix this, you can try running the System File Checker (SFC) scan.
* **Malware infection:** A malware infection can also cause Performance Monitor to use high CPU usage. To scan your computer for malware, you can use a reputable antivirus program.
* **Background tasks:** Background tasks, such as antivirus scans or file downloads, can also cause Performance Monitor to use high CPU usage. To stop these tasks, you can close them from the Task Manager.
* **Hardware problems:** In some cases, hardware problems, such as a faulty hard drive or memory module, can also cause Performance Monitor to use high CPU usage. If you have recently installed new hardware, you can try uninstalling it to see if that fixes the problem.

If you are still having problems after trying these steps, you can contact Microsoft support for help.

Here are some additional things you can do to troubleshoot high CPU usage caused by perfmon.exe:

* **Check for updates:** Make sure that your computer is up to date with the latest Windows updates.
* **Disable unnecessary services:** Some services can run in the background and use up CPU resources. You can disable these services to free up CPU usage.
* **Use a task manager:** A task manager can show you which processes are using up CPU resources. You can use this information to identify the process that is causing the problem and take steps to fix it.
* **Run a virus scan:** A virus scan can detect and remove malware that may be causing the problem.
* **Restore your computer to a previous point in time:** If you have created a restore point, you can restore your computer to a time when the problem was not occurring.

If you are still having problems after trying these steps, you may need to contact a computer technician for help.