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Possible to install windows XP x64 on an external hdd
I have an Acer laptop with windows 7 x64 installed and I want to know if it's possible to install windows xp x64 on an external hard drive. I modified the boot order in the bios to bdrom-external HD-main HD then started the instalation of xp to an active partition of the external HD (it has 2 partitions and only one is active) The instalation goes well untill it has to restart to continue the instalation, that's when "Ntoskrnl.exe is missing" message appears. Can boot normally to w7 if I disconect the external HD but can't install xp on it.