my acer 5100 laptop's keyboard & mouse didn't work, I bough the 2 ports card bus adapter and first 2 times I boot with win7 64 bit, and failed it. and tried with other Vista/XP several times and it's never boot, showing Bootmgr is missing. and I unplug my new hd and battary and leave for half and hr and reboot it but the usb card bus didn't work again. and I am going crazy. help me out pls.
lin lin (Email Id removed for security reasons)