Save a Virus-Ridden Computer or Laptop
If you’ve got a computer so full of viruses that it won’t even boot, you should install AVG Rescue CD Software on your flash drive. The install can get a little complicated, but if you do it correctly, you’ll be able to scan for viruses and recover files all from that one small drive. In general, this requires at least 1GB of free space to do. Check out a tutorial here.