Using a computer without a hard drive.

Step 5: Trinity rescue kit

Trinity Rescue Kit | CPR for your computer - http://trinityhome.org/

Trinity Rescue Kit or TRK is a free live Linux distribution that aims specifically at recovery and repair operations on Windows machines, but is equally usable for Linux recovery issues. Since version 3.4 it has an easy to use scrollable text menu that allows anyone who masters a keyboard and some English to perform maintenance and repair on a computer, ranging from password resetting over disk cleanup to virus scanning.

Great for rescuing files from an mswindows computer that will not boot, but the hard drive is still good. Not half bad virus killer.