I want to root this device:
Is it possible, and can someone link me to a guide please? (I couldn't find a clear cut answer whether it is rootable or not)
YES! It is possible to root the Archos 79 Platinum using the following methods:
And to replace the superuser-app with an English version:
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.