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I have an old hard-drive with Windows 7 and Ubuntu 12.04 LTS installed which I used to dual boot from. I replaced this hard-drive recently and have only been using Ubuntu but I find myself needing to use Windows again on the old HDD. After physically re-connecting the old-drive to my motherboard, and then trying to start Windows 7 from the boot menu I get a blue-screen of death.

I tried starting Windows in recovery mode and doing a system restore but this did not resolve my issue.

Ideally, I would like to be able to remove Ubuntu from my old drive, and let each OS reside on its own HDD.

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When Windows was first installed, the device drivers were installed for the old PC's hardware. Because I installed a new motherboard with a different chipset and CPU there is no way to boot Windows from this old hard-drive without replacing the drivers and settings on the old HDD which is not practical and may make the OS unstable.

Re-installing Windows on the hard-drive would be easiest.

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