For those of you who have used up your ADE reactivations through Kobo resets, here are the instructions from Adobe to rectify this.
In Adobe Digital Edition (ADE), if you press Ctrl+Shift+D (Windows) or Cmd+Shift+D (Mac) will remove the activation on your computer, and allow you to reactivate with a different ID or the same ID when you launch ADE again.
*Press "Ctrl+Shift+E", this will bring up the "Device Deactivation" dialog.
* Select your Reader and deactivate it.
* Unplug and replug your Reader
*The Device Authorization dialog should show up, and you can authorize again with your Adobe ID.
I can confirm that this worked on my Kobo touch on Win 7x64
