ずっとこれで困っていて、いろいろ検索をしてみたのだけど、結果的に「Migrating Virtual PC Windows servers to KVM」の次の記述が役に立った。 To avoid getting a 0x0000007b / 0x7b BSOD on startup due to the mass storage controller changing, run the registry modifications in MS KB 314082. I save the text inside the “copy here” block to a .reg file and ran it before converting below, and it was enough. Migrating Virtual PC Windows servers to KVM KB314