Hi, I've stumbled upon this keyboard lag thing possible solutions at http://www.havelaptopwilltravel.com/acer-4...a-bios-problem/ while searching for the old Bios 3618 for Aspire 4520. I need to flash it back to the old bios as the latest Bios 3619 which is meant for MS Windows Vista had caused some glitches and few BSODs to my Xp pro system. Will stick to the old settings until, should there be any, Bios update for Xp is available.