Unfortunately, I don't know any solution to this ~~ some standard comments below in case they help anyone else, but I think too late to help you.
A few straws that may help ...
- My belief is that if you now deregister you Adobe ID and revert to anonymous ID, it will give you a new anonymous ID rather than a refresh of the old one.
It might be worth trying that, though. ctrl-shift-D to deregister, cmd-shift-D on Mac.
In the long run you should revert to registration with your real ID, but it might just give a chance to recover your old book. - Another possibility is that if you have a system backup from before you registered you may be able to recover the old anonymous ID.
Registration is at least partly held in the registry: [at HKEY_CURRENT_USER\Software\Adobe\Adept\Activation\0000\0000\\value etc]
http://forums.adobe.com/thread/905348?start=0&tstart=0 - You can contact the vendor and see if they can help, but unfortunately I think it is equivalent to your asking them
'The copy of the (real) book you sold me has got burnt. Can you give me another copy free, please?'
If any of those does help please post back
~~~
This is a vicious trap that Adobe lays for unsuspecting customers.
They do give very mild warnings, but not nearly strong enough.
When you register 'without ID', ADE creates an anonymous/implicit ID with limited powers (eg can't be used to share with other devices).
Whenever you first load a DRM book, that copy of the book is associated with whatever ID the computer is registered to at the time.
Any book you load while this anonymous ID is active gets associated with that ID, and can't be read on any other device.
When you properly register your computer with a real ID, that old anonymous ID is lost.
Now you don't have any devices that can read the book.
The only way I know round this is to use a DRM stripper such as epubee BEFORE you deauthorize the device.
I do NOT advocate using such code to get around the valid limitations placed on a DRM book.
However, where the problem arises only because of the ineptness of Adobe's ADEPT DRM infrastructure and its implementation,
such a measure is totally justifiable.