Have a client with small office that includes 3 Windows 7 Pro workstations. One is the file sharing PC, one is a Thinkpad laptop, and the last is a HP workstation. They all run Norton Security Deluxe and have been working fine up until last Friday... Routine password updates were performed on Friday evening to the administrator accounts on all computers. File sharing worked fine, but Outlook and IE had lost all of their saved credentials (passwords). After entering the passwords to e-mail into Outlook 2010 again, e-mail was working fine. Once the user logs off (Shutdown/reboot included), the problem returns. It only effects the accounts which had passwords changed. And it affected all 3 computers! Have run virus scans, and CHKDSK on the laptop as a trial and no problems found. Will run SFC next.