Windows 7 computers lose their saved credentials after account password change (3 for 3)

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.
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Jason JohanknechtIT ManagerAsked:
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JohnBusiness Consultant (Owner)Commented:
File sharing works fine (Could have been affected by updates).
Outlook 2010 and IE lose passwords. That is strange and normally (myself / all clients) does not happen.
See what happens with SFC.

Then do a thorough scrub for Viruses and Malware. This could affect all three machines.
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William FulksSystems Analyst & WebmasterCommented:
Make sure you have all the latest Windows and Office updates installed. I've seen that little bug before in Outlook but not sure about the IE one.
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JohnBusiness Consultant (Owner)Commented:
I have not seen Office updates lose credentials but do try updating.
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William FulksSystems Analyst & WebmasterCommented:
John loves to shoot down other's comments. Here's an official post from Microsoft on the topic: https://support.microsoft.com/en-us/help/2762344/outlook-continues-to-prompt-for-credentials-after-your-domain-password
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JohnBusiness Consultant (Owner)Commented:
I was trying to provide the other side of the coin, not shoot anyone down. Across 150 Machines or more with Windows 7, Office 2010, we did not have any lose their Outlook or IE credentials. We have seen some where the password was asked again even though the credential was intact.

We have now moved off of Office 2010 entirely.
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Jason JohanknechtIT ManagerAuthor Commented:
I will update the post after SFC.  Thanks for responses.
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Jason JohanknechtIT ManagerAuthor Commented:
Ran SFC, and found (Removed) Slimware Utilites & Driver updater.  Removed both and so far computer #1 is working properly again.  Have to wait until this evening to get access to the other 2 computers.
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JohnBusiness Consultant (Owner)Commented:
Thanks - Please keep us posted.
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Jason JohanknechtIT ManagerAuthor Commented:
SFC on the laptop resolved everything.  Both computers are getting Windows updates correctly.  They had not updated since 2017.  Cannot check the final computer until the evening.  Keep in mind, we knew all of the passwords... it is only the credentials being lost every reboot that really was resolved.
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Jason JohanknechtIT ManagerAuthor Commented:
After updating all 3 computers with Windows 7 updates and rebooting.  The problems were resolved.  It has been a couple weeks now, and still working flawlessly.
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