Why Firefox gives an error "not guaranteed".

I recently built a new computer and disabled Windows features for the computer to function more quickly.
When I installed Firefox, I kept getting an error message "this connection is not approved" when you try to access any site that requires information of connection such as Google, Facebook and even the Mozilla site. When I have access to these sites, do not load the images and some pages are displayed in plain text as if there is no CSS file.
Applications such as Gtalk won't open a session, and I can't log on to MMO I downloaded via steam.

I made a collage of this kind of errors I get. Note that I tried other browsers (Chrome) and got similar error messages.

http://imgur.com/r2IyhCg

Hello, please make sure you system date and time are correctly set: error "this connection is untrusted" message - what to do

Tags: Firefox

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