I too am having problems with rooting my 101 G9.
The problem I am having is with the USB driver. The driver provided by Archos does not appear to work on either x86 or x64 systems. If I enable USB debugging and connect the device, everything goes fine up until it finds a device called ARCHOS, which it cannot find the driver for, even if I direct it to the folder containing the unzipped Archos drivers. It simply says that a compatible driver cannot be found. The exact same thing happens if I plug it into my x86 Windows 7 machine, or my x64 Windows 7 machine.
MTP and CTP modes both work fine, despite this! I can open up the device in Windows and browse/copy files as normal. But "adb devices" shows nothing at all.