I recently had some problems with this type of ntb.
I tryed to remove pre-installed win 7 and install win XP, that wasnt that bad, it needed just to switch HDD from achi to ide and insert cd with xp and format one drive to install xp cleanly. However acer doesnt have drivers for win xp on this type of machine, and i couldnt turn wifi on. Lots of sites with drivers didnt help me one bit. In the end this package did it for me, try it.