I also have the problem of losing "all" my passwords including Adobe PS, MS Outlook pop email sign-ins, MS Windrive etc.
To the layman like myself, it would appear that the folders where these passwords are stored are being wiped on exit or as an alternative not being saved properly. IE in a temp folder or similar.
Hopefully, Windows' techs are aware of the problem and that it will be fixed.
The cause was the 2004 update. No problems prior to that.
Thanks for any assistance.
Your problem could very well be IE itself. I have not used IE in years because of it's lack of security and numerous problems as I have always used Firefox. You might try signing in to your MS account on IE to see if your passwords reappear and sync your settings in the browser. Personally I have IE turned off in my computer. I know you had to sign in to MS account on Edge and on Chrome you had to sign in to your Google account to get your passwords so that may be with IE now. I know you no longer need to do so with EDGE and I got rid of Chrome. Make sure your computer has no outstanding updates left to install. It is always a good idea to backup your saved passwords on a weekly basis. Good luck.
Cheers