From your clean computer I need you to make a disk using the Avira Rescue system. The instructions to make it and use it are linked to below. If you run it but cannot save the log, just let me know how it went.
Please download the Avira Rescue system
on the clean computer. Then go here
and there are instructions on how to burn the CD, how to run the scan with it, and how to save the log.
You need these instructions, because this scan is actually done after having booted to the CD which runs a Distro of Linux, so it is a little different from windows.