The password is stored at the SPW key (which stands for Saved PassWords). The
location is here:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\IntelliForms\SPW
Secret...these passwords and other autocomplete info can be easily decrypted
by using special password revealing utilities.
If the non registry method doesn't work to get back the lost prompt box, you
can fix the problem by deleting this whole key. However, if you have a lot of
passwords saved and dread the thought of losing them all, then use this
method:
1. Select the SPW key, click File > Export and then save it as a reg file
(i.e., spw.reg)
2. Once exported and saved, right click the SPW key in the registry and
choose Delete.
3. Login to the site that was giving you the problem and enter your user
name and password. This time the dialog box will come up and you can choose
Yes to remembering your password.
4. Double click the reg export you made to merge those settings back into
the registry.
And there you go—your problem is fixed and you didn’t have to lose your
other passwords.
But it was "NO"...do NOT remember my password, that I mistakenly checked!
Secret...it makes no difference whether you chose YES or NO. Your password
is saved at the SPW key regardless of your choice. Saving your password is
not the same as remembering it to Windows. When you click NO, the password
has to exist so that Windows will know what action to take with it (offer to
remember it or not). To remember or not remember is controlled by more
complex binary values hidden deep under the Protected Storage key.
HKEY_CURRENT_USER\Software\Microsoft\Protected Storage System Provider
That's where all your AutoComplete info is held and, though it is possible
to hack these values, it is not something you can just turn on or off with a
simple yes or no.
The easiest way to view these passwords is with a freeware utility call
Protected Storage Passview it can be found here
http://www.nirsoft.net/utils/pspv.html