SYMPTOMS
When you run Outlook Express using Microsoft Windows 2000 or Microsoft Windows XP and connect to your Internet Service Provider (ISP) to retrieve e-mail messages from a Post Office Protocol (POP) server, your password is not retained even though you have chosen to save it.
CAUSE
The registry contains incorrect information for the Protected Storage System Provider registry subkey for your account.
RESOLUTION
View the link below and follow Microsoft’s instructions: