Got nailed with one on my W7 machine, pulled all power, including battery, let it sit overnight, booted in safe mode, went to repair, then it directed me to restore, then restarted.
Seems to be gone for now, anyhow.
Wasn't FBI, but a "Homeland Security" bug. Didn't even bother reading it before I killed power to the machine.
No external drives on this machine.
Will do a quick MSE scan later.