Window 8.1 update & invalid security certificate errors

I set up my new PC 2 days ago running Windows 8.1. I was able to visit all websites, including secure ones, w/no issues via Firefox. Last night, suddenly I was unable to access many secure websites. These include Google (Gmail) & Ilines (email). Here is a copy of the Google error:
"mail.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer)"
There is no button to bypass, as I have seen in the past. I tried deleting cert8.db which didn't resolve anything. I have also tried adding exceptions which also don't resolve the issue.
I searched support & found the link for the MS document (link below) indicating that FF & Windows Family Safety certificates are not playing nice.
http://support.microsoft.com/kb/2965142/en-us#appliesto
I tried to follow the guide, but when I get to step 6, there is no Microsoft Family Safety Certificate in the Trusted Root Certificates Authorities to export. For reference, I do not specifically have Family Safety enabled & am running my PC as admin, no other users. I personally have no use for this but it is my understanding that it cannot be uninstalled, either.
I have spent hours researching & making adjustments to different settings to no avail. It is frustrating enough setting up a new PC & transferring info w/out this extra hassle. Does anyone have any other suggestions? FF is my preferred browser, but if this can't be resolved I will need to use something else so that I can access these important websites.

Thanks for the feedback cor-el. Here are the results:
1. Installed Kaspersky certificate per link= no change
2. Turned off Kaspersky= able to log in to Gmail but not the other secure sites I am having probs with
3. Booted in Safe Networking mode= able to log in to Gmail but not the other secure sites. Same blocking errors on Gmail, etc when returned to reg mode.
Just FYI, I get 2 different secure connection errors:
Gmail: "mail.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer)"
Ilines: "Secure Connection Failed An error occurred during a connection to mail.ilines.net. Peer's certificate has an invalid signature. (Error code: sec_error_bad_signature)"

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Invalid security certificate error when connecting from office for iPad

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Plus, I have never used anything from Conduit - ''the founder of that company has a shady past with different internet companies puling all dorts of "stuff", IMO. And all Conduit add-ons were removed and banned from the official add-ons website a few years ago because of their "antics" and major user uproar at the time - just recently have we seen a few return''.
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Site name) uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)

I am working with Firefox 35.0 I get the security certificate error message of site name) uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer).
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Check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
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Troubleshooting Information
This page contains technical information that might be useful when you're
trying to solve a problem. If you are looking for answers to common questions
about Firefox, check out our support web site.
Copy all to clipboard
Application Basics
Name
Firefox
Version
3.6.3
Profile Directory
Show in Finder
Installed Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Modified Preferences
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browser.history_expire_days.mirror 180
browser.places.smartBookmarksVersion 2
browser.startup.homepage_override.mstone rv:1.9.2.3
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Technical Details
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Last edited by architech (2009-03-28 07:23:47)

architech wrote:
oops:P
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Window 8.1 update & invalid security certificate errors

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