YES! It is possible to root the Archos 97b79 Platinum HD using the following methods:
VROOT-root exe file for use on Windows machines
And to replace the superuser-app with an English version:
English Superuser and busybox etc
Yoy may also first want to check out the following link to make sure USB works properly (also google on how to enable developer-mode and USB-debugging on Android devices in general):
I just rooted my device, so I know for sure that it works.