KB2686509 がエラー

これは

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00010409]
"Layout File"="KBDDV.DLL"
"Layout Id"="0002"
"Layout Text"="米国 - Dvorak"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00030409]
"Layout File"="KBDUSL.DLL"
"Layout Id"="001A"
"Layout Text"="米国 - Dvorak 左手用"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layouts\00040409]
"Layout File"="KBDUSR.DLL"
"Layout Id"="001B"
"Layout Text"="米国 - Dvorak 右手用"

このへんけせばいい。