Re: Annoying ACPI message after updating Asus Eee PC Seashell to Windows 10.
Thanks! Finally solved for me too. Here's what worked (in Sept 2015):
1. Go to http://www.asus.com/Notebooks/Eee_PC_1225B/HelpDesk_Download/
2. At "Please select OS", choose "Window 8 32bit" (or as appropriate. I had Windows 7 and updated directly to Windows 10, but Win10 was not yet listed as an option. Installing the "Windows 8" option made the annoying error message finally disappear from my screen).
3. From the list that appears, click "Others (2)".
4. The second option listed was "Hotkey service" (V1.48). Click the blue "Global" disk icon to download the driver. (I did not uninstall the older version driver before installing the new driver and have had no issues.)
5. Follow the directions on your screen to complete the installation and then restart your computer.
Hope this helps!