I don't use Wideview.
I haven't upgraded any drivers, not even the Nvidia ones.
These two are entirely separate issues.
Problems caused by wrong Esellerate libraries installed by Wideview would probably cause crashes, but issues with drivers won't, they might just cause a bogus new hardware detection message, requiring to confirm the activation, but they would NOT cause a crash.
Regardless if you updated drivers or not, this doesn't necessarily mean that one of your drivers STARTED to report a new hardware id to Windows, because it was affected by something else, even simply a bug of the driver.
But again, in the worse case, you'll have to confirm your activation, and that's it, it would NOT crash.
I installed the old version after multiple uninstall and re-installs after searching the forum and finding it was a solution for somebody else.
You must have confused the solution with another problem because, nobody ever reported THIS kind of crash (after the activation confirmation). ALL crashes reported on the forum, which can be (mistakenly, because the real solution is another one) "fixed" by using an old version, were all related to a problem of a crash at start, or FSX not even starting.
You are reporting something that NOBODY, ever reported before. Usually, and always because of OTHER programs interfering, like antivirus, or missing system libraries, the Addon Manager won't start, or it would crash at start.
Instead, if I understand correctly, it seems it works normally, UNTIL you try to confirm the Serial Number for the activation which, as I've said, never happened and nobody ever reported it before.
I can only guess problems with your registry (like permission problems on the registry keys or registry keys corrupted/missing), but it's obviously impossible to know, without any other previous case. The only thing it's sure, it's something very specific to your installation, that will surely go away with a Windows reinstall.
If it's ok for you, we might try the remote assistance route, using Teamviewer, as explained here:
http://www.fsdreamteam.com/forum/index.php/topic,10489.0.html