look like ASUS doen't like you to install windows 7 because the touch pad is connected to this device before it can be seen on device manager,
Understand that is normal. Remember, the operating system and thus drivers are not loaded until well into the boot process, past POST (power on self-test) when the boot drive is finally touched. If the touch pad were not connected before that, you could not navigate around the BIOS Setup Menu, or trigger Safe Mode, or select a different OS in dual-boot systems.
Yes true but why not the old nice working with all system USB ? my point is i don't see the point of connecting the touch pad to an I2C I/O device and even if they are generic driver for Win7 for this device make it not working.
...if i am right shame on ASUS
What OS originally come on this system? If W10 (or W8), I see no reason the notebook maker should be held accountable to ensure drivers for a 7 year old legacy operating system are available.