I just finished installing Windows 7 64bit on my 4520, it is f2, change boot drive to DVD and save changes + exit....reboot with your Win 7 DVD in the drive and everything is self explain...I did a clean install, ie custom install, formatted the partition I want to install and that was the 2nd partition which name is ACER...after it finish installed some
drivers and it works fine....btw the hidden partition which contain the original home basic 32bit is still there.