Finally I resolved this issue. Enable/Disable tests from HCT 12 have a bug, although they can´t ping this runs ok. But with HCT 12.0.1 sometimes test machine can´t ping to others,and this test fail. The faster solution is configure in the same network a static IP´s in the computer you´re testing and remote computer, and connect these ones with a crossed cable, then pinks runs ok, and Enable/disable-Device I/O test pass OK. I hope this can help to other guys testers of WHQL.