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I said "no" to remembering a password.  How do I make Internet Explorer ask again?

Passwords are saved in one of two places - in <username>.pwl or in a cookie stored on the system. For a web page based password request, you need to find the cookie for the site in question and delete it.

For password prompt from IE, go to tools, internet options, content, autocomplete and turn on the option to remember passwords.

Deleting the DWORD AskUser in the right hand pane of REGEDIT may help if all else fails.

AutoComplete, User Names and Passwords on Forms
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\IntelliForms\SPW

My computer freezes when I try to delete passwords via Tools, Internet Options, Content, Autocomplete

Since your computer freezes when you try to delete passwords via tools, internet options, content, autocomplete I suspect the relevant reg.key is damaged.

Using regedit, back up your registry. Export the following reg key and then delete it (just the key, not the whole folder).

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\IntelliForms\SPW