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win7 downgrade to xp pro - unknown disc

datatechdc
datatechdc asked
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Last Modified: 2012-06-21
i am downgrading my lenovo x100e from win7 home prem to xp pro. i have external usb drive and i start the install of xp pro. however, when it gets to the part where you pick a disc it says unknown disc.

i cant seem to get around this.

help.
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