The virus has infected every file except FORMAT.COM, and that’s the only program left. Even the diagnostics program is busted. You don’t have any floppies, and there’s no point in salvaging anything.

The spindle turns a full circle. You format, and reboot. The virus is gone, but so is FORMAT.COM. If you get infected again, you will never be cleaned again.

Uh, I’m being revolutionarily cryptic.