I’ve deleted by mistake the registry key:
Software/Microsoft/Internet Explorer/IntelliForms/Storage1
As a result, IE7 Auto-Complete stopped working.
I tried to fix the problem by recreate the deleted keys under IntelliForms:
Create new Key: Storage1
Create new empty Value: C6FB044EC2BD401521D6B1082276415638196D8004
It didn’t work for me.
How can cause IE7 to renew the Auto-Complete mechanism

IE7 Forms Auto Complete Stopped Working
Pockey
I had the exact same problem with passwords and user-names refusing to be remembered by the IE7 supplied with Vista.
The only solution I found was to creat a new Account and copy the account settings over from old to new.
Something like this:-
Firstly. create a new account under Control Panel, User Accounts - give it administrator rights. Log on in the new account.
WilderLand
rod 001
That was my ultimate solution, too. Now, all is OK.
Interestingly, I also noticed that Outlook wouldn't work properly when I was having this problem with IE autocomplete. Outlook was apparently unable to manage the password for the IMAP connection to my mail server, so it kept re-prompting me for the username and password. A network trace showed that each time it was trying to log into the IMAP server using an empty password, even though I kept typing one in to the prompt dialog.
Beetle54
I'm also having a problem where IE7 suddenly acts as if no auto-complete items have been saved, and creating new ones seems to have no effect; I am always being prompted for the same entries at the same sites.
I have verified the settings in IE7 and verified that Protected Storage service is running.
Are there any other steps I can take