Error Code "E_ADEPT_REQUEST_EXPIRED" when authorizing

Question

I am trying to help someone use ADE 2.0.1 for library books.  The first time we installed the program and tried to authorize the computer with their Adobe ID and password, it returned the "E_ADEPT_REQUEST_EXPIRED" error code.
Seeing the cause of this problem in other forums, I checked the date/time/zone on the computer, which is running WIndows 7.  It was set to the incorrect time zone, so we reset to the proper time zone, restarted the computer, and then readjusted the time to be correct.
Unfortunately, this did not resolve the issue, and further attempts to authorize the computer returned the same "E_ADEPT_REQUEST_EXPIRED" error code; uninstalling and reinstalling Adobe ADE 2.0.1 after fixing the time zone and time resulted in the same error code upon attempts to authorize.  Changing the password at adobe.com did not work either.
I am unsure of what to do at this point--everything I've read says the "E_ADEPT_REQUEST_EXPIRED" error code means you need to fix the date/time/zone on the computer, which we have done.  After multiple restarts and reinstallations, why are we still getting this same error message, and what can we do to properly authorize ADE with an Adobe ID?
Help much appreciated.

Answer 1

I tried removing the authorization using ctrl-shift-D, but that didn't work either.
Do you mean it didn't deauthorize, or that after deauthorizing you still couldn't authorize?
If the first, you must be in Library view for it to work.
Would you recommend installing an older version of the software?
Yes, I'd certainly give it a try ~ you may have seen in other posts I often suggest it.
I hope it works for you in this case ....
Just in case you haven't seen the download details ...
~~~~~~~~~
There are lots of bugs in ADE2.0 (and 2.0.1).  Try replacing ADE2.0 with the older but more reliable v1.7.2.
(You can have them both installed at once if you like.)
Version 1.7.2, it is a little difficult to find, available on Adobe site for Windows and for Mac.
http://helpx.adobe.com/digital-editions/kb/cant-install-digital-editions.html
The forum software is sometimes corrupting the link above.  There shouldn't be a blank in 'editio ns.html'.  The following redirects to the same page: http://tinyurl.com/diged172
Some people have found ADE trying to upgrade automatically. 
It appears (not 100% sure) that if you install ADE2.0 as a new install (not as an upgrade) that your 1.7.2 will continue to run.
Probably best to say no if 2.0.x installation asks if you want to migrate your library.