Asus M6N - Manual (Page 22)

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Software
Drivers
Double click Unknown device. Click Reinstall Driver.
Select “Install from...” and click Next. Browse to your operating system folder in the
“ATK0100” folder and click Next.
Click Finish when setup is complete. “ATK0100 ACPI UTILITY” should show under
System devices.
ATKACPI Setup
This utility requires that you manually install it from Device Manager. No software operation is required.