Having the above problem on Asus U57a Laptop ounce I loaded Windows 10. I do not have HP Simple Pass. It was Asus Smart Gesture. I tried setting using Show Hidden Icons in right of taskbar to display touchpad app, then disable all its settings. That did
not do the trick for me. I have a wireless mouse using a USB port, so I tried using fn + f9 to disable the touchpad. That had always worked under Windows 7, but does not work in Windows 10. I think Asus needs to update their drivers.
I had to use Ctrl + Alt + Delete to open Task Manager, click for Details, and find the Asus Smart Gesture process, then delete it. That immediately stopped the flashing. That only fixes it till a reboot, when it must be done all over again. For now, it appears there is no permanent fix. If someone finds one, please let me know.
Till then, I may have to resort to using a wired mouse.