Sorry for the double post, but I've bit my knuckles and decided to restore the first Registry backup with the broken WMI, although there was some stuff I had to reinstall annoyingly enough. I then followed Boggin's instructions:
Using the Registry Restore would just give you back the WMI problems, but you can do that then run a command prompt as an administrator and enter these commands for a specific WMI fix.
winmgmt /standalonehost
net stop winmgmt
winmgmt /resetrepository
net start winmgmt
You may get a message to say that is already started.
Enter shutdown /r /t 00 to effect and immediate reboot.
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Yeah I tried that, and...
I still have broken WMI. I even used Tweaking.com and only repaired the WMI, but that didn't do any good either. Plus, I still have a broken Premiere Pro.
I'm completely boned, I've wasted week-ends on this stupid thing, and either way, I have horrible defects that annoy me. I might as well just revert back to the Registries where I have broken folders, at least I could work on Word.
Edit: Well the folder problem seems ""OK"", for now, it sort of fixed itself after I restored the "Good WMI" registries. But now, how do I fix Error 0x80004005 ? Stuff online always speaks of network issues, but I just can't set stars and genres on music anymore.
I can't fix a problem without getting another, it's maddening, and I'm even scared of ever using Tweaking.com (Windows Repair) at this point.
Edit 2: I've reused the tool afterall, but I still have Error 0x80004005, and it seems that video files thumbnails are broken, not displaying at all. I can't use the tool anymore, and I've been using the latest update. I decided to System Restore back to where I have the broken folders.
Edit 3: So apparently the solution to my Folder resetting was incredibly simple; make a Registry backup, and reload it immediatly after. I did a Power Reset, and it remained mostly functionnal, however there's still the cellphone producing audio files.