After applying the fix, confirm success via three methods:
Sometimes Launch Manager installs but the driver doesn't stick. Here is how to force it: Acpi Nsc6001 Windows 7 Acer
Download the Unknown Device driver for Windows 7, 8, 8.1, and 10 (64-bit) for Acer - Extensa 5220 - DriverIdentifier After applying the fix, confirm success via three
Right-click "Computer" and select Manage, then Device Manager. Right-click the "Unknown Device" (ACPI\NSC6001). Select Update Driver Software. Choose Browse my computer for driver software. After applying the fix
October 2025 Target OS: Windows 7 (32-bit & 64-bit) Hardware: Acer Aspire Laptops (Notably 5740, 5741, 5742, 7740, 7741, 5552 series)