EEPC has no particular issues with ACHI, but some BIOS manufacturers don't implement it according to the standards, so there can be issues. You might have to change to compatibility mode AFTER installing the correct disk drivers into Windows, or work with your McAfee representative to get a sample device into McAfee development for anaysis.
Just tried it,
reinstall the OS AFTER change it to compatibility mode,
So, here's the question:
does this happen on all machine that installed with AHCI mode?
do you mean ALL of this particular make/model, or ALL machines? If it's the former - maybe, it would depend on the bios version, hardware version etc, if you mean the latter, no, the vast majority of machines work fine out of the box - there were some issues with Dell 6420's etc recently, but Dell released a new BIOS version to fix the problem.
Most machines work perfectly out of the box, it's just the odd one which ships with something buggy which has to be worked around by us, or by the manufacturer.